Bump matplotlib from 3.8.4 to 3.9.0 (#41)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.8.4 to 3.9.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/matplotlib/matplotlib/releases">matplotlib's releases</a>.</em></p>
<blockquote>
<h2>REL: 3.9.0</h2>
<p>Highlights of this release include:</p>
<ul>
<li>Plotting and Annotation improvements
<ul>
<li>Axes.inset_axes is no longer experimental</li>
<li>Legend support for Boxplot</li>
<li>Percent sign in pie labels auto-escaped with usetex=True</li>
<li>hatch parameter for stackplot</li>
<li>Add option to plot only one half of violin plot</li>
<li>axhline and axhspan on polar axes</li>
<li>Subplot titles can now be automatically aligned</li>
<li>axisartist can now be used together with standard Formatters</li>
<li>Toggle minorticks on Axis</li>
<li>StrMethodFormatter now respects axes.unicode_minus</li>
</ul>
</li>
<li>Figure, Axes, and Legend Layout
<ul>
<li>Subfigures now have controllable zorders</li>
<li>Getters for xmargin, ymargin and zmargin</li>
</ul>
</li>
<li>Mathtext improvements
<ul>
<li>mathtext documentation improvements</li>
<li>mathtext spacing corrections</li>
</ul>
</li>
<li>Widget Improvements
<ul>
<li>Check and Radio Button widgets support clearing</li>
</ul>
</li>
<li>3D plotting improvements
<ul>
<li>Setting 3D axis limits now set the limits exactly</li>
</ul>
</li>
<li>Other improvements
<ul>
<li>New BackendRegistry for plotting backends</li>
<li>Add widths, heights and angles setter to EllipseCollection</li>
<li>image.interpolation_stage rcParam</li>
<li>Arrow patch position is now modifiable</li>
<li>NonUniformImage now has mouseover support</li>
</ul>
</li>
</ul>
<h2>REL: v3.9.0rc2</h2>
<p>This is the second release candidate for the meso release 3.9.0.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/matplotlib/matplotlib/commit/be56634d682bed257cb941369d8d3600635ddadf"><code>be56634</code></a> REL: v3.9.0</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/846ce8a4889b7cc4e755de5af0d041a742be7282"><code>846ce8a</code></a> DOC: Finish documentation for 3.9.0</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/8604f671d3a6179ef47dfbc3efef562a7448c384"><code>8604f67</code></a> Merge pull request <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28206">#28206</a> from meeseeksmachine/auto-backport-of-pr-28205-on-v...</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/196c8db2074c9a3d91a9e144c21f7ef204905988"><code>196c8db</code></a> TST: Followup corrections to <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28205">#28205</a></li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/d8f301644fa839c0f0ae2a438d42dbc55b4dc223"><code>d8f3016</code></a> Backport PR <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28205">#28205</a>: TST: Fix tests with older versions of ipython</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/4db5ac9c5719d7681157b7c2979e582e35baa8bc"><code>4db5ac9</code></a> Merge pull request <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28203">#28203</a> from QuLogic/auto-backport-of-pr-28164-on-v3.9.x</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/ef1a2db3f7c7124b5091dd9f58ea254731dbeafc"><code>ef1a2db</code></a> Merge pull request <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28204">#28204</a> from meeseeksmachine/auto-backport-of-pr-28195-on-v...</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/e4384b80c3e470c98eb7a5d04699ffff2f3a70ba"><code>e4384b8</code></a> Merge pull request <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28191">#28191</a> from QuLogic/no-dev-theme</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/3b65546e92166b9ed5b4e026f6bec08234a38eb5"><code>3b65546</code></a> Backport PR <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28195">#28195</a>: TST: Prepare for pytest 9</li>
<li><a href="https://github.com/matplotlib/matplotlib/commit/1b526c3286becf1e7fdfe9291d437aa19c8f3bb5"><code>1b526c3</code></a> Backport PR <a href="https://redirect.github.com/matplotlib/matplotlib/issues/28164">#28164</a>: CI: Ensure code coverage is always uploaded</li>
<li>Additional commits viewable in <a href="https://github.com/matplotlib/matplotlib/compare/v3.8.4...v3.9.0">compare view</a></li>
</ul>
</details>
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</details>

requirements.txt

@@ -1,3 +1,3 @@
-matplotlib==3.8.4
+matplotlib==3.9.0
 nbconvert==7.16.4
 jupyter-book==1.0.0