Bump maven-source-plugin from 3.2.0 to 3.2.1

Bumps [maven-source-plugin](https://github.com/apache/maven-source-plugin) from 3.2.0 to 3.2.1.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/apache/maven-source-plugin/commit/a59a2e481f7d8e46f2abbd339d2d27e9b2964eba"><code>a59a2e4</code></a> [maven-release-plugin] prepare release maven-source-plugin-3.2.1</li>
<li><a href="https://github.com/apache/maven-source-plugin/commit/c954a7e8fed86efc554e401361f88cdbf4109267"><code>c954a7e</code></a> make build as reproducible as possible for now</li>
<li><a href="https://github.com/apache/maven-source-plugin/commit/d5b98783436d9bff8737b63adc566466d2d8590a"><code>d5b9878</code></a> [MSOURCES-123] set archiver reproducible mode earlier</li>
<li><a href="https://github.com/apache/maven-source-plugin/commit/258d666ee76782c5211519313803fad9a8b408e1"><code>258d666</code></a> MSOURCES-122 make output independant from OS newline</li>
<li><a href="https://github.com/apache/maven-source-plugin/commit/5b4e02fbb49beb2f3e9ce3e001054519019a76fe"><code>5b4e02f</code></a> [maven-release-plugin] prepare for next development iteration</li>
<li>See full diff in <a href="https://github.com/apache/maven-source-plugin/compare/maven-source-plugin-3.2.0...maven-source-plugin-3.2.1">compare view</a></li>
</ul>
</details>
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Fixes #120

COPYBARA_INTEGRATE_REVIEW=#120 from google:dependabot/maven/org.apache.maven.plugins-maven-source-plugin-3.2.1 343ec4a
PiperOrigin-RevId: 336293249

pom.xml

@@ -163,7 +163,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-source-plugin</artifactId>
-          <version>3.2.0</version>
+          <version>3.2.1</version>
         </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>