Bump phonopy from 2.33.3 to 2.33.4 (#2591)

Bumps [phonopy](https://github.com/phonopy/phonopy) from 2.33.3 to
2.33.4.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/phonopy/phonopy/blob/develop/doc/changelog.md">phonopy's
changelog</a>.</em></p>
<blockquote>
<h2>Dec-28-2024: Version 2.33.4</h2>
<ul>
<li>Restore symfc dependency</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/phonopy/phonopy/commit/b00a0b63eb8550d5e6df60eafdb0ebd6386084e7"><code>b00a0b6</code></a>
Merge branch 'develop'</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/c54cdefe7f68ece9e7facabbfa9b20f9b1e15881"><code>c54cdef</code></a>
Merge pull request <a
href="https://redirect.github.com/phonopy/phonopy/issues/489">#489</a>
from phonopy/release</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/a30fb51fcf6c640b121d007dcf775af2c7b01322"><code>a30fb51</code></a>
Set version 2.33.4</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/557570b8cbc2de22be5a53e416f9b5d24e2e1746"><code>557570b</code></a>
Merge pull request <a
href="https://redirect.github.com/phonopy/phonopy/issues/488">#488</a>
from phonopy/dvec-to-svec</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/0bc714406442e864e942ed757cb3794f8e290647"><code>0bc7144</code></a>
Update dense_to_sparse_svecs</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/cfdd69d4edfb33dd6f4eaaf1b4c467d9f54afa27"><code>cfdd69d</code></a>
Add function dense_to_sparse_svecs</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/a1418960368f8091536d9a311d851db21e7ec41e"><code>a141896</code></a>
Restore symfc dependency</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/3a66540a3d67209bc93cdeea4a3c39d60edb810d"><code>3a66540</code></a>
Minor fix</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/7e25ff3b0c92092e35e1caf08da905ece45bb28d"><code>7e25ff3</code></a>
Merge pull request <a
href="https://redirect.github.com/phonopy/phonopy/issues/487">#487</a>
from SergeevGregory/patch-1</li>
<li><a
href="https://github.com/phonopy/phonopy/commit/3b6b5a56c1dec331d86ac7dee32c8ae69c64b1f7"><code>3b6b5a5</code></a>
Update calculator.py</li>
<li>Additional commits viewable in <a
href="https://github.com/phonopy/phonopy/compare/v2.33.3...v2.33.4">compare
view</a></li>
</ul>
</details>
<br />


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tests/requirements-phonons.txt

@@ -1,2 +1,2 @@
-phonopy==2.33.3
+phonopy==2.33.4
 seekpath==2.1.0