Bump furo from 2024.1.29 to 2024.5.6 (#169)

Bumps [furo](https://github.com/pradyunsg/furo) from 2024.1.29 to
2024.5.6.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/pradyunsg/furo/blob/main/docs/changelog.md">furo's
changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<!-- raw HTML omitted -->
<h2>2024.05.06 -- Cheerful Cerulean</h2>
<ul>
<li>✨ Add new custom icons for auto mode, reflecting the currently
active theme.</li>
<li>✨ Add a view this page button.</li>
<li>✨ Add colours and highlighting to &quot;version modified&quot; API
helpers.</li>
<li>✨ Add release information to various customisation knobs.</li>
<li>Make all icons bigger and use a thinner stroke with them.</li>
</ul>
<h2>2024.04.27 -- Bold Burgundy</h2>
<ul>
<li>Add a skip to content link.</li>
<li>Add <code>--font-stack--headings</code>.</li>
<li>Add <code>:visited</code> colour and enforce uniform contrast
between light/dark.</li>
<li>Add an offset of <code>:target</code> to reduce back-to-top
overlap.</li>
<li>Improve dark mode colours.</li>
<li>Fix outstanding colour contrast warnings on Firefox.</li>
<li>Fix bad indent in footnotes.</li>
<li>Tweak handling of default configuration options in a more resilient
manner.</li>
<li>Tweak length and sizing of API <code>source</code> links.</li>
<li>Stop search engine indexing on search page.</li>
</ul>
<h2>2024.01.29 -- Amazing Amethyst</h2>
<ul>
<li>Fix canonical url when building with <code>dirhtml</code>.</li>
<li>Relicense the demo module.</li>
</ul>
<h2>2023.09.10 -- Zesty Zaffre</h2>
<ul>
<li>Make asset hash injection idempotent, fixing Sphinx 6
compatibility.</li>
<li>Fix the check for HTML builders, fixing non-HTML Read the Docs
builds.</li>
</ul>
<h2>2023.08.19 -- Xenolithic Xanadu</h2>
<ul>
<li>Fix missing search context with Sphinx 7.2, for dirhtml builds.</li>
<li>Drop support for Python 3.7.</li>
<li>Present configuration errors in a better format -- thanks <a
href="https://github.com/AA-Turner"><code>@​AA-Turner</code></a>!</li>
<li>Bump <code>require_sphinx()</code> to Sphinx 6.0, in line with
dependency changes in Unassuming Ultramarine.</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pradyunsg/furo/commit/b087e931bec009e4dffc98dab0ed85b2511d4bb6"><code>b087e93</code></a>
Prepare release: 2024.05.06</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/169c63dcc6f79314f5f54d8ce960ef14e51eaf11"><code>169c63d</code></a>
Update the changelog</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/b7ec84d9c1e259d21de8fde980d9df7f1687f2a5"><code>b7ec84d</code></a>
Drop discussion of Sphinx's <code>basic</code> theme</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/2cd4d4a883b472c81c7ccf908a8bae0b2b8e1792"><code>2cd4d4a</code></a>
Demote the note about inherited from <code>basic</code>
configuration</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/983d6c396aa1a151a05db17c756aa3c2fb5ea4ef"><code>983d6c3</code></a>
Tweak the colours for API <code>versionmodified</code> information</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/1ffbf767cc9378c795224f45fe7136a738e11afc"><code>1ffbf76</code></a>
Add release information to various customisation knobs</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/2c386b9da563884ee9d293d74bab2886c8f28320"><code>2c386b9</code></a>
Use the appropriate Sphinx directive instead of weird text</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/ec8815ae68b287bf2d2ae923238963a50d2812f6"><code>ec8815a</code></a>
Add (back?) support for RtD context inference on top of page
buttons</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/1b4cf89684ae5a7819082f2918729045f76589f6"><code>1b4cf89</code></a>
Bump the npm group with 5 updates (<a
href="https://redirect.github.com/pradyunsg/furo/issues/793">#793</a>)</li>
<li><a
href="https://github.com/pradyunsg/furo/commit/ce8fb1079b1112f788bccd292538b1cdce37c5ab"><code>ce8fb10</code></a>
Bump the github-actions group with 3 updates (<a
href="https://redirect.github.com/pradyunsg/furo/issues/792">#792</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/pradyunsg/furo/compare/2024.01.29...2024.05.06">compare
view</a></li>
</ul>
</details>
<br />


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