Bump pydantic from 2.7.2 to 2.7.3 (#2206)

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.7.2 to
2.7.3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/pydantic/pydantic/releases">pydantic's
releases</a>.</em></p>
<blockquote>
<h2>v2.7.3 (2024-06-03)</h2>
<h2>What's Changed</h2>
<h3>Packaging</h3>
<ul>
<li>Bump <code>pydantic-core</code> to <code>v2.18.4</code> by <a
href="https://github.com/sydney-runkle"><code>@​sydney-runkle</code></a>
in <a
href="https://redirect.github.com/pydantic/pydantic/pull/9550">#9550</a></li>
</ul>
<h3>Fixes</h3>
<ul>
<li>Fix u style unicode strings in python <a
href="https://github.com/samuelcolvin"><code>@​samuelcolvin</code></a>
in <a
href="https://redirect.github.com/pydantic/jiter/pull/110">pydantic/jiter#110</a></li>
</ul>
<p>Full Changelog: <a
href="https://github.com/pydantic/pydantic/compare/v2.7.2...v2.7.3/">https://github.com/pydantic/pydantic/compare/v2.7.2...v2.7.3/</a>*</p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/pydantic/pydantic/blob/main/HISTORY.md">pydantic's
changelog</a>.</em></p>
<blockquote>
<h2>v2.7.3 (2024-06-03)</h2>
<p><a
href="https://github.com/pydantic/pydantic/releases/tag/v2.7.3">GitHub
release</a></p>
<h3>What's Changed</h3>
<h4>Packaging</h4>
<ul>
<li>Bump <code>pydantic-core</code> to <code>v2.18.4</code> by <a
href="https://github.com/sydney-runkle"><code>@​sydney-runkle</code></a>
in <a
href="https://redirect.github.com/pydantic/pydantic/pull/9550">#9550</a></li>
</ul>
<h4>Fixes</h4>
<ul>
<li>Fix u style unicode strings in python <a
href="https://github.com/samuelcolvin"><code>@​samuelcolvin</code></a>
in <a
href="https://redirect.github.com/pydantic/jiter/pull/110">pydantic/jiter#110</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pydantic/pydantic/commit/9f48fc28db791ad15e389c3c0bf7dcbdd81dd0eb"><code>9f48fc2</code></a>
prep for 2.7.3 release (<a
href="https://redirect.github.com/pydantic/pydantic/issues/9551">#9551</a>)</li>
<li><a
href="https://github.com/pydantic/pydantic/commit/1f8c7d7b27d23eb62317a6d803d4e6ddd4624897"><code>1f8c7d7</code></a>
Bump <code>pydantic-core</code> to <code>v2.18.4</code> (<a
href="https://redirect.github.com/pydantic/pydantic/issues/9550">#9550</a>)</li>
<li>See full diff in <a
href="https://github.com/pydantic/pydantic/compare/v2.7.2...v2.7.3">compare
view</a></li>
</ul>
</details>
<br />


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tests/requirements.txt

@@ -6,7 +6,7 @@ maggma==0.67.0
 monty==2024.5.24
 numpy==1.26.4
 psutil==5.9.8
-pydantic==2.7.2
+pydantic==2.7.3
 pydantic-settings==2.3.0
 pymatgen==2024.5.1
 ruamel.yaml==0.18.6