Bump pynacl from 1.6.0 to 1.6.1 in /scan (#165)

Bumps [pynacl](https://github.com/pyca/pynacl) from 1.6.0 to 1.6.1.
<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>1.6.1 (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>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="077559e610"><code>077559e</code></a>
bump for 1.6.1 (<a
href="https://redirect.github.com/pyca/pynacl/issues/906">#906</a>)</li>
<li><a
href="4f2eada50c"><code>4f2eada</code></a>
Bump actions/upload-artifact from 4 to 5 (<a
href="https://redirect.github.com/pyca/pynacl/issues/904">#904</a>)</li>
<li><a
href="d8185db3ce"><code>d8185db</code></a>
Bump actions/download-artifact from 5.0.0 to 6.0.0 (<a
href="https://redirect.github.com/pyca/pynacl/issues/903">#903</a>)</li>
<li><a
href="f986caa8de"><code>f986caa</code></a>
Update Python version from 3.14t-dev to 3.14t (<a
href="https://redirect.github.com/pyca/pynacl/issues/901">#901</a>)</li>
<li><a
href="e8d3bc7a6f"><code>e8d3bc7</code></a>
use 3.14.0 in CI (<a
href="https://redirect.github.com/pyca/pynacl/issues/900">#900</a>)</li>
<li><a
href="f08cb9c399"><code>f08cb9c</code></a>
build macOS wheels on macos-15 (arm64) (<a
href="https://redirect.github.com/pyca/pynacl/issues/898">#898</a>)</li>
<li><a
href="eb41815aba"><code>eb41815</code></a>
Update macOS runner version in CI workflow (<a
href="https://redirect.github.com/pyca/pynacl/issues/897">#897</a>)</li>
<li><a
href="7f418a0894"><code>7f418a0</code></a>
Honor MAKE environment variable (<a
href="https://redirect.github.com/pyca/pynacl/issues/895">#895</a>)</li>
<li><a
href="84afafd90e"><code>84afafd</code></a>
Require CFFI 2.0.0 or newer on Python &gt;= 3.9 (<a
href="https://redirect.github.com/pyca/pynacl/issues/894">#894</a>)</li>
<li>See full diff in <a
href="https://github.com/pyca/pynacl/compare/1.6.0...1.6.1">compare
view</a></li>
</ul>
</details>
<br />


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scan/requirements.txt

@@ -1,6 +1,6 @@
 checkdmarc==5.10.12
 dkimpy==1.1.8
-PyNaCl==1.6.0
+PyNaCl==1.6.1
 pyspf==2.0.14
 python-multipart==0.0.20
 validators==0.35.0