Bump build.buf:buf from 1.63.0 to 1.64.0 (#403)

Bumps [build.buf:buf](https://github.com/bufbuild/buf) from 1.63.0 to
1.64.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/bufbuild/buf/releases">build.buf:buf's
releases</a>.</em></p>
<blockquote>
<h2>v1.64.0</h2>
<ul>
<li>Fix LSP completion for options.</li>
<li>Add LSP document highlighting support.</li>
<li>Add LSP completion for fully-qualified type references.</li>
<li>Improve LSP semantic tokens implementation (for syntax
highlighting).</li>
<li>Add LSP organize imports code action to add missing imports, remove
unused imports, and sort imports alphabetically.</li>
<li>Add LSP document link support.</li>
<li>Add LSP folding range support.</li>
<li>Update <code>PROTOVALIDATE</code> lint rule to support checking
<code>cel_expression</code> fields for valid CEL.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/bufbuild/buf/blob/main/CHANGELOG.md">build.buf:buf's
changelog</a>.</em></p>
<blockquote>
<h2>[v1.64.0] - 2026-01-19</h2>
<ul>
<li>Fix LSP completion for options.</li>
<li>Add LSP document highlighting support.</li>
<li>Add LSP completion for fully-qualified type references.</li>
<li>Improve LSP semantic tokens implementation (for syntax
highlighting).</li>
<li>Add LSP organize imports code action to add missing imports, remove
unused
imports, and sort imports alphabetically.</li>
<li>Add LSP document link support.</li>
<li>Add LSP folding range support.</li>
<li>Update <code>PROTOVALIDATE</code> lint rule to support checking
<code>cel_expression</code> fields for valid CEL.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/bufbuild/buf/commit/8ecc976ddc58ac372f045092202061f3c53f9f88"><code>8ecc976</code></a>
Release v1.64.0 (<a
href="https://redirect.github.com/bufbuild/buf/issues/4293">#4293</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/40597f158cc17721c1c96f0485bce61fafc6e61a"><code>40597f1</code></a>
Make upgrade (<a
href="https://redirect.github.com/bufbuild/buf/issues/4292">#4292</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/49785647e5e0e316f3fa2c2dab7bca225579018b"><code>4978564</code></a>
Prevent LSP renaming symbols in non-local files (<a
href="https://redirect.github.com/bufbuild/buf/issues/4286">#4286</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/1831f857b508e56dd30e4ae80777f8e364a46095"><code>1831f85</code></a>
Add LSP semantic highlighting for CEL in protovalidate options (<a
href="https://redirect.github.com/bufbuild/buf/issues/4285">#4285</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/d59e05aaebfbb7aa7ebe83909b6fe52f6484ca1d"><code>d59e05a</code></a>
Add cel_expression validation to PROTOVALIDATE lint rule (<a
href="https://redirect.github.com/bufbuild/buf/issues/4284">#4284</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/0adc664afe3d076666440a05339fc8a84f3f949c"><code>0adc664</code></a>
Add LSP completion for next field in enums (<a
href="https://redirect.github.com/bufbuild/buf/issues/4283">#4283</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/f0379289fe8d49c941bb4d1186f0764cb13f50c0"><code>f037928</code></a>
Add LSP folding range support (<a
href="https://redirect.github.com/bufbuild/buf/issues/4280">#4280</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/c5ba50acf1a4e4fada3f214dd7d664997092ff6a"><code>c5ba50a</code></a>
Add CHANGELOG for LSP document link (<a
href="https://redirect.github.com/bufbuild/buf/issues/4282">#4282</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/9d76a64ea4b53cffa2c409e32e9e815cb74887ff"><code>9d76a64</code></a>
Add LSP DocumentLink support (<a
href="https://redirect.github.com/bufbuild/buf/issues/4279">#4279</a>)</li>
<li><a
href="https://github.com/bufbuild/buf/commit/83b4b426ec7727c018a5f1a2b92b3d7c588e8d5b"><code>83b4b42</code></a>
Add LSP organize imports code action (<a
href="https://redirect.github.com/bufbuild/buf/issues/4277">#4277</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/bufbuild/buf/compare/v1.63.0...v1.64.0">compare
view</a></li>
</ul>
</details>
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gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 assertj = "3.27.6"
-buf = "1.63.0"
+buf = "1.64.0"
 cel = "0.11.1"
 error-prone = "2.46.0"
 junit = "5.14.2"