Bump org.apache.maven.plugins:maven-site-plugin from 3.20.0 to 3.21.0

Bumps [org.apache.maven.plugins:maven-site-plugin](https://github.com/apache/maven-site-plugin) from 3.20.0 to 3.21.0.
- [Release notes](https://github.com/apache/maven-site-plugin/releases)
- [Commits](apache/maven-site-plugin@maven-site-plugin-3.20.0...maven-site-plugin-3.21.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-site-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -696,7 +696,7 @@
                 <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-site-plugin</artifactId>
-                  <version>3.20.0</version>
+                  <version>3.21.0</version>
                   <configuration>
                         <skip>true</skip>
                         <skipDeploy>true</skipDeploy>