Build(deps): Bump matplotlib from 3.9.1 to 3.9.1.post1 (#1164)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.9.1
to 3.9.1.post1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/matplotlib/matplotlib/commit/9c9792a66900de7740fa6428f7fe59edb5083c60"><code>9c9792a</code></a>
DOC: Add Zenodo DOI for 3.9.1</li>
<li><a
href="https://github.com/matplotlib/matplotlib/commit/60bfa22f28a4bd20c8911451614d47ac175b58d4"><code>60bfa22</code></a>
BLD: bump branch away from tag</li>
<li>See full diff in <a
href="https://github.com/matplotlib/matplotlib/compare/v3.9.1...v3.9.1.post1">compare
view</a></li>
</ul>
</details>
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