Bump librt from 0.7.8 to 0.8.1 (#12090)

Bumps [librt](https://github.com/mypyc/librt) from 0.7.8 to 0.8.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/mypyc/librt/commit/e9c167e17aa3c1e949befa90cc8d062fea6eeaaa"><code>e9c167e</code></a>
Sync mypy</li>
<li><a
href="https://github.com/mypyc/librt/commit/26eb1d2c3e63228473f9ca2d299cdc4191c9cdc1"><code>26eb1d2</code></a>
Bump version to 0.8.0; add tests for base64</li>
<li><a
href="https://github.com/mypyc/librt/commit/588d6c63282a3923232bc71e5e1dd3074149240a"><code>588d6c6</code></a>
Sync mypy: base64 is non-experimental now</li>
<li><a
href="https://github.com/mypyc/librt/commit/80dcab7e367e0b5b1cd7788f59a4af6791376efb"><code>80dcab7</code></a>
feat: Build wheel for riscv64 (<a
href="https://redirect.github.com/mypyc/librt/issues/31">#31</a>)</li>
<li>See full diff in <a
href="https://github.com/mypyc/librt/compare/v0.7.8...v0.8.1">compare
view</a></li>
</ul>
</details>
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requirements/constraints.txt

@@ -104,7 +104,7 @@ jinja2==3.1.6
     # via
     #   sphinx
     #   towncrier
-librt==0.7.8
+librt==0.8.1
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/dev.txt

@@ -102,7 +102,7 @@ jinja2==3.1.6
     # via
     #   sphinx
     #   towncrier
-librt==0.7.8
+librt==0.8.1
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/lint.txt

@@ -43,7 +43,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.7.2
     # via -r requirements/lint.in
-librt==0.7.8
+librt==0.8.1
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/test-common.txt

@@ -34,7 +34,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.8.0 ; python_version < "3.14"
     # via -r requirements/test-common.in
-librt==0.7.8
+librt==0.8.1
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/test-ft.txt

@@ -57,7 +57,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.8.0 ; python_version < "3.14"
     # via -r requirements/test-common.in
-librt==0.7.8
+librt==0.8.1
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/test.txt

@@ -57,7 +57,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.7.2 ; python_version < "3.14"
     # via -r requirements/test-common.in
-librt==0.7.8
+librt==0.8.1
     # via mypy
 markdown-it-py==4.0.0
     # via rich