Python: Update pyarrow requirement from <21.0,>=12.0 to >=12.0,<22.0 in /python (#12836)

Updates the requirements on [pyarrow](https://github.com/apache/arrow)
to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/apache/arrow/releases">pyarrow's
releases</a>.</em></p>
<blockquote>
<h2>Apache Arrow 21.0.0</h2>
<p>Release Notes URL: <a
href="https://arrow.apache.org/release/21.0.0.html">https://arrow.apache.org/release/21.0.0.html</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/apache/arrow/commit/ee4d09ebef61c663c1efbfa4c18e518a03b798be"><code>ee4d09e</code></a>
MINOR: [Release] Update versions for 21.0.0</li>
<li><a
href="https://github.com/apache/arrow/commit/f13a5796008e3a5e546af1a7b2be0fbd3c148c26"><code>f13a579</code></a>
MINOR: [Release] Update .deb/.rpm changelogs for 21.0.0</li>
<li><a
href="https://github.com/apache/arrow/commit/6fd2a167e0ed74dbe4c059e579a561fcc2aae11f"><code>6fd2a16</code></a>
MINOR: [Release] Update CHANGELOG.md for 21.0.0</li>
<li><a
href="https://github.com/apache/arrow/commit/cf261bf58ae74a1f7fa99d81c201ca8e1d679c9b"><code>cf261bf</code></a>
<a
href="https://redirect.github.com/apache/arrow/issues/47078">GH-47078</a>:
[Release] Ensure using cloned apache/arrow for reproducible check
(...</li>
<li><a
href="https://github.com/apache/arrow/commit/ddbc3dc005dfdde5a79d42cb5953190479b12b73"><code>ddbc3dc</code></a>
<a
href="https://redirect.github.com/apache/arrow/issues/47074">GH-47074</a>:
[Release] Use reproducible mtime for csharp/ in source archive (<a
href="https://redirect.github.com/apache/arrow/issues/47">#47</a>...</li>
<li><a
href="https://github.com/apache/arrow/commit/0534eb2d279f445ac67b99a22eca344484749b6f"><code>0534eb2</code></a>
<a
href="https://redirect.github.com/apache/arrow/issues/47071">GH-47071</a>:
[Release] Dereference all hard links in source archive (<a
href="https://redirect.github.com/apache/arrow/issues/47072">#47072</a>)</li>
<li><a
href="https://github.com/apache/arrow/commit/f845b4184664aee522f7fd73864d3093e84b6580"><code>f845b41</code></a>
<a
href="https://redirect.github.com/apache/arrow/issues/47069">GH-47069</a>:
[Release] Add missing &quot;needs: target&quot; (<a
href="https://redirect.github.com/apache/arrow/issues/47070">#47070</a>)</li>
<li><a
href="https://github.com/apache/arrow/commit/1c08f8ee6947bd2a9bffb441af946c6a7373015b"><code>1c08f8e</code></a>
<a
href="https://redirect.github.com/apache/arrow/issues/47067">GH-47067</a>:
[Release] Fix wrong GitHub Actions context in verify_rc.yml (<a
href="https://redirect.github.com/apache/arrow/issues/47068">#47068</a>)</li>
<li><a
href="https://github.com/apache/arrow/commit/70e5c51e6d5de1ca6f669b47ff0b98e1075336d0"><code>70e5c51</code></a>
<a
href="https://redirect.github.com/apache/arrow/issues/47065">GH-47065</a>:
[Release] Fix timeout key in verify_rc.yml (<a
href="https://redirect.github.com/apache/arrow/issues/47066">#47066</a>)</li>
<li><a
href="https://github.com/apache/arrow/commit/254a85c8bddb52eef03d623882836717f027061d"><code>254a85c</code></a>
<a
href="https://redirect.github.com/apache/arrow/issues/47063">GH-47063</a>:
[Release] Define missing RELEASE_TARBALL (<a
href="https://redirect.github.com/apache/arrow/issues/47064">#47064</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/apache/arrow/compare/go/v12.0.0...apache-arrow-21.0.0">compare
view</a></li>
</ul>
</details>
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python/pyproject.toml

@@ -145,7 +145,7 @@ sql = [
 ]
 usearch = [
     "usearch ~= 2.16",
-    "pyarrow >= 12.0,< 21.0"
+    "pyarrow >= 12.0,< 22.0"
 ]
 weaviate = [
     "weaviate-client>=4.10,<5.0",