Bump time-machine from 2.11.0 to 2.12.0 (#582)

Bumps [time-machine](https://github.com/adamchainz/time-machine) from
2.11.0 to 2.12.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/adamchainz/time-machine/blob/main/CHANGELOG.rst">time-machine's
changelog</a>.</em></p>
<blockquote>
<h2>2.12.0 (2023-08-14)</h2>
<ul>
<li>Include wheels for Python 3.12.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/adamchainz/time-machine/commit/f91a4bab684953fa748af0cd107ee3b25f362a86"><code>f91a4ba</code></a>
Version 2.12.0</li>
<li><a
href="https://github.com/adamchainz/time-machine/commit/e0c7992341144cad1ade74ce5972251a5a044f4c"><code>e0c7992</code></a>
Actually build 3.12 wheels (<a
href="https://github.com/adamchainz/time-machine/issues/373">#373</a>)</li>
<li><a
href="https://github.com/adamchainz/time-machine/commit/b665b559621e3ca1e35aa2412b87535d3f83761e"><code>b665b55</code></a>
Build wheels for Python 3.12 (<a
href="https://github.com/adamchainz/time-machine/issues/372">#372</a>)</li>
<li><a
href="https://github.com/adamchainz/time-machine/commit/ad345cf1f7b85db0642d7e37f251e48f0b5107cd"><code>ad345cf</code></a>
Upgrade requirements (<a
href="https://github.com/adamchainz/time-machine/issues/371">#371</a>)</li>
<li><a
href="https://github.com/adamchainz/time-machine/commit/02e3f57a8124724bc7a10e50fdfe8e31c9f8ee07"><code>02e3f57</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://github.com/adamchainz/time-machine/issues/370">#370</a>)</li>
<li><a
href="https://github.com/adamchainz/time-machine/commit/ed88d87fee8a2ebd8740c0d6f2b7c59e847d99bf"><code>ed88d87</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://github.com/adamchainz/time-machine/issues/367">#367</a>)</li>
<li><a
href="https://github.com/adamchainz/time-machine/commit/9eaac12292a35d058a5547acd7292464f6577659"><code>9eaac12</code></a>
Upgrade requirements (<a
href="https://github.com/adamchainz/time-machine/issues/366">#366</a>)</li>
<li><a
href="https://github.com/adamchainz/time-machine/commit/0027f4db547c9eab86ca84f576851e0081f62c81"><code>0027f4d</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://github.com/adamchainz/time-machine/issues/365">#365</a>)</li>
<li>See full diff in <a
href="https://github.com/adamchainz/time-machine/compare/2.11.0...2.12.0">compare
view</a></li>
</ul>
</details>
<br />

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</details>

pyproject.toml

@@ -82,7 +82,7 @@ dev-pytest = [
   "pytest == 7.4.0",
   "pytest-mock == 3.11.1",
   "pytest-asyncio == 0.21.1",
-  "time-machine == 2.11.0",
+  "time-machine == 2.12.0",
   "async-solipsism == 0.5",
   # For checking docstring code examples
   "sybil == 5.0.3",