Bump pyrefly from 0.51.0 to 0.52.0 in /backend (#1559)

Bumps [pyrefly](https://github.com/facebook/pyrefly) from 0.51.0 to
0.52.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/facebook/pyrefly/commit/fb7a49086feef10e01795d9e09859902fe56a994"><code>fb7a490</code></a>
Update pyrefly version]</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/eda9e11b1a7c95d7cd7dc544194433afdf20e0e5"><code>eda9e11</code></a>
fix stale config during indexing</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/ee77b4b497f709a32c70673ff072db00b3b9df05"><code>ee77b4b</code></a>
Avoid HashMap in bindings</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/6de02a92804cd8caa41aef281ebed2e44b28da1f"><code>6de02a9</code></a>
Rearrange code (no actual edits)</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/2b4f85cefff156f738d963f9c0c16b20c7e9d32f"><code>2b4f85c</code></a>
Express HasPlaceholder in the Scc state checks</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/4725cce2f2e19b0619d7089d254def09bfc0c98d"><code>4725cce</code></a>
Bump proc-macro2 1.0.105 -&gt; 1.0.106</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/af7396b333be9aeff361d0f76ff2083d771d26cf"><code>af7396b</code></a>
Use UTF-8 encoding when exporting locations from Pyrefly</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/ab9e4d26b2d0aa595da9f7b572863e33c18d7d18"><code>ab9e4d2</code></a>
Add location test for special symbols in string literals</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/b1fe95d2c4ed939a7b7914943ec7892091fc4d9e"><code>b1fe95d</code></a>
cap concrete tuple size (<a
href="https://redirect.github.com/facebook/pyrefly/issues/2348">#2348</a>)</li>
<li><a
href="https://github.com/facebook/pyrefly/commit/622f03b0d8a71dded26bcd1a2bfe18041a3c551f"><code>622f03b</code></a>
cap literal string size (<a
href="https://redirect.github.com/facebook/pyrefly/issues/2347">#2347</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/facebook/pyrefly/compare/0.51.0...0.52.0">compare
view</a></li>
</ul>
</details>
<br />


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backend/pyproject.toml

@@ -55,7 +55,7 @@ dev = [
     "mypy==1.19.0",
     "pluggy==1.6.0",
     "pylint==4.0.2",
-    "pyrefly==0.51.0",
+    "pyrefly==0.52.0",
     "pytest-asyncio==1.3.0",
     "pytest-cov==7.0.0",
     "pytest-xdist==3.8.0",