Update sphinx requirement from >=1.3 to >=7.4.7 (#26)

Updates the requirements on
[sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest
version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/sphinx-doc/sphinx/releases">sphinx's
releases</a>.</em></p>
<blockquote>
<h2>Sphinx 7.4.7</h2>
<p>Changelog: <a
href="https://www.sphinx-doc.org/en/master/changes.html">https://www.sphinx-doc.org/en/master/changes.html</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/sphinx-doc/sphinx/blob/v7.4.7/CHANGES.rst">sphinx's
changelog</a>.</em></p>
<blockquote>
<h1>Release 7.4.7 (released Jul 20, 2024)</h1>
<h2>Bugs fixed</h2>
<ul>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12096">#12096</a>:
Warn when files are overwritten in the build directory.
Patch by Adam Turner and Bénédikt Tran.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12620">#12620</a>:
Ensure that old-style object description options are respected.
Patch by Adam Turner.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12601">#12601</a>,
<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12625">#12625</a>:
Support callable objects in :py:class:<code>~typing.Annotated</code>
type
metadata in the Python domain.
Patch by Adam Turner.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12601">#12601</a>,
<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12622">#12622</a>:
Resolve :py:class:<code>~typing.Annotated</code> warnings with
<code>sphinx.ext.autodoc</code>,
especially when using :mod:<code>dataclasses</code> as type metadata.
Patch by Adam Turner.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12589">#12589</a>,
<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12626">#12626</a>:
autosummary: Fix warnings with :rst:role:<code>!autolink</code>.
Patch by Adam Turner.</li>
</ul>
<h1>Release 7.4.6 (released Jul 18, 2024)</h1>
<h2>Bugs fixed</h2>
<ul>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12589">#12589</a>,
<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/9743">#9743</a>,
<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12609">#12609</a>:
autosummary: Do not add the package prefix when
generating autosummary directives for modules within a package.
Patch by Adam Turner.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12613">#12613</a>:
Reduce log severity for ambiguity detection during inventory loading.
Patch by James Addison.</li>
</ul>
<h1>Release 7.4.5 (released Jul 16, 2024)</h1>
<h2>Bugs fixed</h2>
<ul>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12593">#12593</a>,
<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12600">#12600</a>:
Revert coercing the type of selected :confval:<code>html_sidebars</code>
values to a list.
Log an error message when string values are detected.
Patch by Adam Turner.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12594">#12594</a>:
LaTeX: since 7.4.0, :rst:dir:<code>seealso</code> and other
&quot;light&quot; admonitions
now break PDF builds if they contain a :dudir:<code>figure</code>
directive; and also
if they are contained in a table cell (rendered by
<code>tabulary</code>).
Patch by Jean-François B.</li>
</ul>
<h1>Release 7.4.4 (released Jul 15, 2024)</h1>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/0d912c85fd3ec385432fe707f6a0678425d1e841"><code>0d912c8</code></a>
Bump to 7.4.7 final</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/bbc97e035720d96f617921dbd25022e121495b98"><code>bbc97e0</code></a>
autosummary: Filter invalid import prefixes in <code>autolink</code> (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12626">#12626</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/6c486a575c858b8b82d2580b76c410121663505f"><code>6c486a5</code></a>
Fix detecting file changes for the overwritten file warning (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12627">#12627</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/2bd973e7191c5bc382c1a92b37ab1f20268f42d6"><code>2bd973e</code></a>
autodoc: Fix warnings with dataclasses in <code>Annotated</code>
metadata (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12622">#12622</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/dd77f851494d24d19aecf0328c6913d121b8b51c"><code>dd77f85</code></a>
Support callables in <code>Annotated</code> types (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12625">#12625</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/1ed4ca7e038364b3b10e3d36abb84ee034d4d94c"><code>1ed4ca7</code></a>
Mark <code>test_build_manpage</code> as XFAIL following changes in
Docutils master</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/cd8ce07d31cfab61b6996cec1334681600dd3259"><code>cd8ce07</code></a>
Update message catalogues following reverted commits</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/c6cd25f50dcc2a0bc369da80e75f105a4821d43b"><code>c6cd25f</code></a>
Partially revert &quot;Update message catalogues (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/11626">#11626</a>)&quot;</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/fa2ba7d5aeaff36aeb1a6c2f49846432fc932c7a"><code>fa2ba7d</code></a>
Partially Revert &quot;[bot]: Update message catalogues (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12563">#12563</a>)&quot;</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/e439c6f33f8d8e7bc06b4f6f25dadfda74869ee0"><code>e439c6f</code></a>
Ensure that old-style object description options are respected (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12620">#12620</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/sphinx-doc/sphinx/compare/v1.3...v7.4.7">compare
view</a></li>
</ul>
</details>
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