Bump freezegun from 1.2.2 to 1.4.0 (#19)

Summary:
Bumps [freezegun](https://github.com/spulec/freezegun) from 1.2.2 to 1.4.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/spulec/freezegun/blob/master/CHANGELOG">freezegun's changelog</a>.</em></p>
<blockquote>
<h2>1.4.0</h2>
<ul>
<li><code>asyncio</code>-support from 1.3.x introduced quite a few  bugs, so that functionality is now hidden behind a flag:
<code>with freeze_time('1970-01-02', real_asyncio=True):</code></li>
</ul>
<h2>1.3.1</h2>
<ul>
<li>Fixed the release number in the build</li>
</ul>
<h2>1.3.0</h2>
<ul>
<li>
<p>Fixed <code>asyncio</code> support to avoid <code>await asyncio.sleep(1)</code> hanging forever.</p>
</li>
<li>
<p>Added support for Python 3.12</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/spulec/freezegun/commit/5e06dff53244992204706adf6907e7138ac96d39"><code>5e06dff</code></a> Increase version number</li>
<li><a href="https://github.com/spulec/freezegun/commit/94f27e606b636356dc6d3bc8445d34cede5dfff8"><code>94f27e6</code></a> Update CHANGELOG with 1.4.0 changes</li>
<li><a href="https://github.com/spulec/freezegun/commit/38647285fe714d3c53df6378cf41a725d73668b9"><code>3864728</code></a> Only mock asyncio on request (<a href="https://redirect.github.com/spulec/freezegun/issues/525">#525</a>)</li>
<li><a href="https://github.com/spulec/freezegun/commit/7ca707d98d22046eb29e55dc7d3c03330bda7f36"><code>7ca707d</code></a> Only mock asyncio on request</li>
<li><a href="https://github.com/spulec/freezegun/commit/1af533984e118f5fe58d3264a52c904737df7d77"><code>1af5339</code></a> Create SECURITY.md</li>
<li><a href="https://github.com/spulec/freezegun/commit/9152728257cc660f8ae7d624a0174278e8c5dc14"><code>9152728</code></a> Increase version number</li>
<li><a href="https://github.com/spulec/freezegun/commit/ff98d1ff018ac1105bb151758e5609872a02f8bb"><code>ff98d1f</code></a> Admin: Ensure version is correct in tagged release</li>
<li><a href="https://github.com/spulec/freezegun/commit/d50e415e3eee14dbff4d06a8c6c315959b73b98d"><code>d50e415</code></a> Admin: Add requirements.txt and tox.ini to sdist</li>
<li><a href="https://github.com/spulec/freezegun/commit/67b18bbf173222aefe8be6872dbb7d13b3631d21"><code>67b18bb</code></a> Admin: Switch to pytest-cov</li>
<li><a href="https://github.com/spulec/freezegun/commit/d31054699b248ee00fa27b37ae89be96d28795c5"><code>d310546</code></a> Add requirements.txt and tox.ini to sdist</li>
<li>Additional commits viewable in <a href="https://github.com/spulec/freezegun/compare/1.2.2...1.4.0">compare view</a></li>
</ul>
</details>
<br />

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</details>

Pull Request resolved: #19

Reviewed By: yurinnick

Differential Revision: D53230363

Pulled By: chantra

fbshipit-source-id: f4a398c0c99c3453b3fd54b86f6f813a9303bb44