Bump mypy from 1.18.2 to 1.19.0 (#11800)

Bumps [mypy](https://github.com/python/mypy) from 1.18.2 to 1.19.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/python/mypy/blob/master/CHANGELOG.md">mypy's
changelog</a>.</em></p>
<blockquote>
<h1>Mypy Release Notes</h1>
<h2>Next Release</h2>
<h3>Drop Support for Python 3.9</h3>
<p>Mypy no longer supports running with Python 3.9, which has reached
end-of-life.
When running mypy with Python 3.10+, it is still possible to type check
code
that needs to support Python 3.9 with the <code>--python-version
3.9</code> argument.
Support for this will be dropped in the first half of 2026!</p>
<p>Contributed by Marc Mueller (PR <a
href="https://redirect.github.com/python/mypy/pull/20156">20156</a>).</p>
<h2>Mypy 1.19</h2>
<p>We’ve just uploaded mypy 1.19.0 to the Python Package Index (<a
href="https://pypi.org/project/mypy/">PyPI</a>).
Mypy is a static type checker for Python. This release includes new
features, performance
improvements and bug fixes. You can install it as follows:</p>
<pre><code>python3 -m pip install -U mypy
</code></pre>
<p>You can read the full documentation for this release on <a
href="http://mypy.readthedocs.io">Read the Docs</a>.</p>
<h3>Python 3.9 Support Ending Soon</h3>
<p>This is the last mypy feature release that supports Python 3.9, which
reached
end of life in October 2025.</p>
<h3>Performance Improvements</h3>
<ul>
<li>Switch to a more dynamic SCC processing logic (Ivan Levkivskyi, PR
<a
href="https://redirect.github.com/python/mypy/pull/20053">20053</a>)</li>
<li>Speed up type aliases (Ivan Levkivskyi, PR <a
href="https://redirect.github.com/python/mypy/pull/19810">19810</a>)</li>
</ul>
<h3>Fixed‑Format Cache Improvements</h3>
<p>Mypy uses a cache by default to speed up incremental runs by reusing
partial results
from earlier runs. Mypy 1.18 added a new binary fixed-format cache
representation as
an experimental feature. The feature is no longer experimental, and we
are planning
to enable it by default in a future mypy release (possibly 1.20), since
it's faster
and uses less space than the original, JSON-based cache format. Use
<code>--fixed-format-cache</code> to enable the fixed-format cache.</p>
<p>Mypy now has an extra dependency on the <code>librt</code> PyPI
package, as it's needed for
cache serialization and deserialization.</p>
<p>Mypy ships with a tool to convert fixed-format cache files to the old
JSON format.
Example of how to use this:</p>
<pre><code>$ python -m mypy.exportjson .mypy_cache/.../my_module.data.ff
</code></pre>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/python/mypy/commit/0f068c9ec604daa09e69c92545b059f4b44f566e"><code>0f068c9</code></a>
Remove +dev</li>
<li><a
href="https://github.com/python/mypy/commit/6d5cf52e67da306b62455cdce4ce9a9ccec35d02"><code>6d5cf52</code></a>
Various updates to 1.19 changelog (<a
href="https://redirect.github.com/python/mypy/issues/20304">#20304</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/3c813083b27c87cf3a32e7422191b02bf59fab6e"><code>3c81308</code></a>
Add draft version of 1.19 release notes (<a
href="https://redirect.github.com/python/mypy/issues/20296">#20296</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/1999a20e9898f673fa2f4c9a91790c075141ba71"><code>1999a20</code></a>
[mypyc] librt base64: use existing SIMD CPU dispatch by customizing
build fla...</li>
<li><a
href="https://github.com/python/mypy/commit/1b94fbb9fbc581de7e057d71e9892e3acbf9a7d3"><code>1b94fbb</code></a>
[mypyc] Fix vtable pointer with inherited dunder new (<a
href="https://redirect.github.com/python/mypy/issues/20302">#20302</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/13369cb25fe450f755f63e59156b86df84c08b3d"><code>13369cb</code></a>
[mypyc] Fix crash on super in generator (<a
href="https://redirect.github.com/python/mypy/issues/20291">#20291</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/a087a5894935cfdbc2eba27a6d04ebca38fd6659"><code>a087a58</code></a>
Update import map when new modules added (<a
href="https://redirect.github.com/python/mypy/issues/20271">#20271</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/35e843cc38cedc1bdf87d9937c06d51189ad0e45"><code>35e843c</code></a>
[mypyc] Add efficient librt.base64.b64decode (<a
href="https://redirect.github.com/python/mypy/issues/20263">#20263</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/094f66dc742cec2d69add9296fb21cdef50624d0"><code>094f66d</code></a>
[mypyc] Add <strong>repr</strong> to AssignmentTarget subclasses (<a
href="https://redirect.github.com/python/mypy/issues/20258">#20258</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/0738db3f9d336622923c7ee143e1c3adf7600a31"><code>0738db3</code></a>
Do not push partial types to the binder (<a
href="https://redirect.github.com/python/mypy/issues/20202">#20202</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/python/mypy/compare/v1.18.2...v1.19.0">compare
view</a></li>
</ul>
</details>
<br />


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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/constraints.txt

@@ -104,6 +104,8 @@ jinja2==3.1.6
     # via
     #   sphinx
     #   towncrier
+librt==0.6.3
+    # via mypy
 markdown-it-py==4.0.0
     # via rich
 markupsafe==3.0.3
@@ -115,7 +117,7 @@ multidict==6.7.0
     #   -r requirements/multidict.in
     #   -r requirements/runtime-deps.in
     #   yarl
-mypy==1.18.2 ; implementation_name == "cpython"
+mypy==1.19.0 ; implementation_name == "cpython"
     # via
     #   -r requirements/lint.in
     #   -r requirements/test-common.in

requirements/dev.txt

@@ -102,6 +102,8 @@ jinja2==3.1.6
     # via
     #   sphinx
     #   towncrier
+librt==0.6.3
+    # via mypy
 markdown-it-py==4.0.0
     # via rich
 markupsafe==3.0.3
@@ -112,7 +114,7 @@ multidict==6.7.0
     # via
     #   -r requirements/runtime-deps.in
     #   yarl
-mypy==1.18.2 ; implementation_name == "cpython"
+mypy==1.19.0 ; implementation_name == "cpython"
     # via
     #   -r requirements/lint.in
     #   -r requirements/test-common.in

requirements/lint.txt

@@ -43,11 +43,13 @@ iniconfig==2.3.0
     # via pytest
 isal==1.7.2
     # via -r requirements/lint.in
+librt==0.6.3
+    # via mypy
 markdown-it-py==4.0.0
     # via rich
 mdurl==0.1.2
     # via markdown-it-py
-mypy==1.18.2 ; implementation_name == "cpython"
+mypy==1.19.0 ; implementation_name == "cpython"
     # via -r requirements/lint.in
 mypy-extensions==1.1.0
     # via mypy

requirements/test-common.txt

@@ -34,11 +34,13 @@ iniconfig==2.3.0
     # via pytest
 isal==1.8.0 ; python_version < "3.14"
     # via -r requirements/test-common.in
+librt==0.6.3
+    # via mypy
 markdown-it-py==4.0.0
     # via rich
 mdurl==0.1.2
     # via markdown-it-py
-mypy==1.18.2 ; implementation_name == "cpython"
+mypy==1.19.0 ; implementation_name == "cpython"
     # via -r requirements/test-common.in
 mypy-extensions==1.1.0
     # via mypy

requirements/test-ft.txt

@@ -57,6 +57,8 @@ iniconfig==2.3.0
     # via pytest
 isal==1.8.0 ; python_version < "3.14"
     # via -r requirements/test-common.in
+librt==0.6.3
+    # via mypy
 markdown-it-py==4.0.0
     # via rich
 mdurl==0.1.2
@@ -65,7 +67,7 @@ multidict==6.7.0
     # via
     #   -r requirements/runtime-deps.in
     #   yarl
-mypy==1.18.2 ; implementation_name == "cpython"
+mypy==1.19.0 ; implementation_name == "cpython"
     # via -r requirements/test-common.in
 mypy-extensions==1.1.0
     # via mypy

requirements/test.txt

@@ -57,6 +57,8 @@ iniconfig==2.3.0
     # via pytest
 isal==1.7.2 ; python_version < "3.14"
     # via -r requirements/test-common.in
+librt==0.6.3
+    # via mypy
 markdown-it-py==4.0.0
     # via rich
 mdurl==0.1.2
@@ -65,7 +67,7 @@ multidict==6.7.0
     # via
     #   -r requirements/runtime-deps.in
     #   yarl
-mypy==1.18.2 ; implementation_name == "cpython"
+mypy==1.19.0 ; implementation_name == "cpython"
     # via -r requirements/test-common.in
 mypy-extensions==1.1.0
     # via mypy