Bump pynacl from 1.5.0 to 1.6.2 in /utils/git (#8045)

Bumps [pynacl](https://github.com/pyca/pynacl) from 1.5.0 to 1.6.2.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/pyca/pynacl/blob/main/CHANGELOG.rst">pynacl's
changelog</a>.</em></p>
<blockquote>
<h2>1.6.2 (2026-01-01)</h2>
<ul>
<li>Updated <code>libsodium</code> to 1.0.20-stable (2025-12-31 build)
to resolve
<code>CVE-2025-69277</code>.</li>
</ul>
<h2>1.6.1 (2025-11-10)</h2>
<ul>
<li>The <code>MAKE</code> environment variable can now be used to
specify the <code>make</code>
binary that should be used in the build process.</li>
</ul>
<h2>1.6.0 (2025-09-11)</h2>
<ul>
<li><strong>BACKWARDS INCOMPATIBLE:</strong> Removed support for Python
3.6 and 3.7.</li>
<li>Added support for the low level AEAD AES bindings.</li>
<li>Added support for
<code>crypto_core_ed25519_from_uniform</code>.</li>
<li>Update <code>libsodium</code> to 1.0.20-stable (2025-08-27
build).</li>
<li>Added support for free-threaded Python 3.14.</li>
<li>Added support for Windows on ARM wheels.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pyca/pynacl/commit/ecf41f55a3d8f1e10ce89c61c4b4d67f3f4467cf"><code>ecf41f5</code></a>
changelog and version bump for 1.6.2 (<a
href="https://redirect.github.com/pyca/pynacl/issues/923">#923</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/685a5e727772c2df81cfce61fb8768122102fa89"><code>685a5e7</code></a>
Switch to PyPI trusted publishing (<a
href="https://redirect.github.com/pyca/pynacl/issues/925">#925</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/78e0aa32b1a0acdd51e2b3bf394e7cb911fc1e68"><code>78e0aa3</code></a>
missed adding these files as part of the libsodium update (<a
href="https://redirect.github.com/pyca/pynacl/issues/924">#924</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/96314884d88d1089ff5f336dba61d7abbcddbbf7"><code>9631488</code></a>
Bump libsodium to the latest 1.0.20 (<a
href="https://redirect.github.com/pyca/pynacl/issues/922">#922</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/563b25bdedf666e86f0cc2a95321cd23a960260e"><code>563b25b</code></a>
Add script to update vendored libsodium (<a
href="https://redirect.github.com/pyca/pynacl/issues/921">#921</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/d23310561899d1ca4fd4026a646893b2af6b6c21"><code>d233105</code></a>
Include libsodium license in wheels (<a
href="https://redirect.github.com/pyca/pynacl/issues/917">#917</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/cabc3a879d142e62f7503a632e62e706ef5eccbb"><code>cabc3a8</code></a>
Bump dessant/lock-threads from 5 to 6 (<a
href="https://redirect.github.com/pyca/pynacl/issues/914">#914</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/f3596177b3a43a49b211ff2a3f9ea133f1cf8f23"><code>f359617</code></a>
Bump actions/download-artifact from 6.0.0 to 7.0.0 (<a
href="https://redirect.github.com/pyca/pynacl/issues/915">#915</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/fb6e37f76dcf9f93d3f65bb31abdb548816126b6"><code>fb6e37f</code></a>
Bump actions/upload-artifact from 5 to 6 (<a
href="https://redirect.github.com/pyca/pynacl/issues/916">#916</a>)</li>
<li><a
href="https://github.com/pyca/pynacl/commit/526f99278383ffda906bec9d08288191dcbbc3b3"><code>526f992</code></a>
Bump actions/checkout from 6.0.0 to 6.0.1 (<a
href="https://redirect.github.com/pyca/pynacl/issues/911">#911</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/pyca/pynacl/compare/1.5.0...1.6.2">compare
view</a></li>
</ul>
</details>
<br />


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utils/git/requirements_formatting.txt

@@ -40,7 +40,7 @@ pygithub==1.59.1
     # via -r llvm/utils/git/requirements_formatting.txt.in
 pyjwt[crypto]==2.8.0
     # via pygithub
-pynacl==1.5.0
+pynacl==1.6.2
     # via pygithub
 requests==2.32.4
     # via pygithub