Bump org.apache.maven.plugins:maven-javadoc-plugin from 3.6.2 to 3.6.3

Bumps [org.apache.maven.plugins:maven-javadoc-plugin](https://github.com/apache/maven-javadoc-plugin) from 3.6.2 to 3.6.3.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/8205008d0db43c5da4bff6995bdcf6a466a0217f"><code>8205008</code></a> [maven-release-plugin] prepare release maven-javadoc-plugin-3.6.3</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/b69af90253f769a2669754aa978eded271bf690e"><code>b69af90</code></a> [MJAVADOC-682] Reactor builds fail when multiple modules with same groupId:ar...</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/b47b280ed9c509b49c54c5da170c3ce759835730"><code>b47b280</code></a> directory, not folder</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/488624f07293b7253fa6f21603502e35b7c34cde"><code>488624f</code></a> [MJAVADOC-782] Align read-only parameters naming with other plugins</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/867dc73ce0d98474e438b7b122dee444f9f2ebe2"><code>867dc73</code></a> [MJAVADOC-781] Upgrade plugins and components (in ITs)</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/0104ab2cc67dfc24d824e057ee6ffb802789e182"><code>0104ab2</code></a> Fix incorrect config in test-javadoc-test-plugin-config.xml</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/dd39c0c12079bd8ddf06a2e335a6b1638a1dd5e6"><code>dd39c0c</code></a> [MJAVADOC-780] add missing plugin configuration</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/e6e6180e3cff55224c3d6919ed23131645e0fa35"><code>e6e6180</code></a> Remove junk from 692d7a8a9918efd24633a44f0f3d4dfd22d0fec4</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/692d7a8a9918efd24633a44f0f3d4dfd22d0fec4"><code>692d7a8</code></a> [MJAVADOC-779] - Upgrade maven-plugin parent to 41</li>
<li><a href="https://github.com/apache/maven-javadoc-plugin/commit/386d4ea2ad68b18c8b9bc467b7e57742f60849d9"><code>386d4ea</code></a> Remove dead link</li>
<li>Additional commits viewable in <a href="https://github.com/apache/maven-javadoc-plugin/compare/maven-javadoc-plugin-3.6.2...maven-javadoc-plugin-3.6.3">compare view</a></li>
</ul>
</details>
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Fixes #382

COPYBARA_INTEGRATE_REVIEW=#382 from google:dependabot/maven/org.apache.maven.plugins-maven-javadoc-plugin-3.6.3 4b27d6d
PiperOrigin-RevId: 587749532

pom.xml

@@ -134,7 +134,7 @@
       </plugin>
       <plugin>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>3.6.2</version>
+        <version>3.6.3</version>
         <configuration>
           <additionalJOptions>
             <additionalJOption>--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED</additionalJOption>
@@ -222,7 +222,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-javadoc-plugin</artifactId>
-            <version>3.6.2</version>
+            <version>3.6.3</version>
             <executions>
               <execution>
                 <id>attach-docs</id>