Bump org.apache.maven.plugins:maven-gpg-plugin from 3.2.0 to 3.2.1

Bumps [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 3.2.0 to 3.2.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/apache/maven-gpg-plugin/releases">org.apache.maven.plugins:maven-gpg-plugin's releases</a>.</em></p>
<blockquote>
<h2>3.2.1</h2>
<p><a href="https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12317521&amp;version=12354394">JIRA link</a></p>
<h1>Release Notes - Maven GPG Plugin - Version 3.2.1</h1>
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<hr />
<h2>What's Changed</h2>
<ul>
<li>[MGPG-112] serverId def value was unintentionally dropped by <a href="https://github.com/cstamas"><code>@​cstamas</code></a> in <a href="https://redirect.github.com/apache/maven-gpg-plugin/pull/80">apache/maven-gpg-plugin#80</a></li>
<li>[MGPG-111] Fix dependencies by <a href="https://github.com/cstamas"><code>@​cstamas</code></a> in <a href="https://redirect.github.com/apache/maven-gpg-plugin/pull/81">apache/maven-gpg-plugin#81</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/apache/maven-gpg-plugin/compare/maven-gpg-plugin-3.2.0...maven-gpg-plugin-3.2.1">https://github.com/apache/maven-gpg-plugin/compare/maven-gpg-plugin-3.2.0...maven-gpg-plugin-3.2.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/apache/maven-gpg-plugin/commit/5b69086e7d2a48d985b6190cf75f1d0eb4ce2ecf"><code>5b69086</code></a> [maven-release-plugin] prepare release maven-gpg-plugin-3.2.1</li>
<li><a href="https://github.com/apache/maven-gpg-plugin/commit/28d298c2a9049c3a8535f97100670638ce48b724"><code>28d298c</code></a> [MGPG-111] Fix dependencies (<a href="https://redirect.github.com/apache/maven-gpg-plugin/issues/81">#81</a>)</li>
<li><a href="https://github.com/apache/maven-gpg-plugin/commit/75d8ed56a05e7e886a61a92f076506b8ffba2bd1"><code>75d8ed5</code></a> [MGPG-112] serverId def value was unintentionally dropped (<a href="https://redirect.github.com/apache/maven-gpg-plugin/issues/80">#80</a>)</li>
<li><a href="https://github.com/apache/maven-gpg-plugin/commit/2a11a2d667a6dbe17b8f037a8b822a1b16326a73"><code>2a11a2d</code></a> [maven-release-plugin] prepare for next development iteration</li>
<li>See full diff in <a href="https://github.com/apache/maven-gpg-plugin/compare/maven-gpg-plugin-3.2.0...maven-gpg-plugin-3.2.1">compare view</a></li>
</ul>
</details>
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</details>

Fixes #325

COPYBARA_INTEGRATE_REVIEW=#325 from google:dependabot/maven/org.apache.maven.plugins-maven-gpg-plugin-3.2.1 efbefc9
PiperOrigin-RevId: 617249691

pom.xml

@@ -187,7 +187,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-gpg-plugin</artifactId>
-          <version>3.2.0</version>
+          <version>3.2.1</version>
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>