Bump org.apache.maven.plugins:maven-site-plugin from 3.12.0 to 3.20.0

Bumps [org.apache.maven.plugins:maven-site-plugin](https://github.com/apache/maven-site-plugin) from 3.12.0 to 3.20.0.
- [Release notes](https://github.com/apache/maven-site-plugin/releases)
- [Commits](apache/maven-site-plugin@maven-site-plugin-3.12.0...maven-site-plugin-3.20.0)

---
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] <support@github.com>

pom.xml

@@ -65,7 +65,7 @@
         <maven.checkstyle.plugin.version>3.5.0</maven.checkstyle.plugin.version>
         <com.puppycrawl.tools.checkstyle.version>10.8.1</com.puppycrawl.tools.checkstyle.version>
         <jacoco.maven.plugin.version>0.8.8</jacoco.maven.plugin.version>
-        <maven.site.plugin.version>3.12.0</maven.site.plugin.version>
+        <maven.site.plugin.version>3.20.0</maven.site.plugin.version>
         <maven.project.info.reports.plugin.version>3.7.0</maven.project.info.reports.plugin.version>
         <maven.surefire.plugin.version>3.2.2</maven.surefire.plugin.version>
         <maven.failsafe.plugin.version>2.22.2</maven.failsafe.plugin.version>