Bump org.apache.maven.plugins:maven-site-plugin from 3.12.1 to 3.20.0 (…

…#528)

Bumps [org.apache.maven.plugins:maven-site-plugin](https://github.com/apache/maven-site-plugin) from 3.12.1 to 3.20.0.
- [Commits](apache/maven-site-plugin@maven-site-plugin-3.12.1...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -36,7 +36,7 @@
     <version.release.plugin>3.1.1</version.release.plugin>
     <version.deploy.plugin>3.1.2</version.deploy.plugin>
     <version.source.plugin>3.3.1</version.source.plugin>
-    <version.site.plugin>3.12.1</version.site.plugin>
+    <version.site.plugin>3.20.0</version.site.plugin>
     <version.surefire.plugin>${version.surefire}</version.surefire.plugin>
     <version.surefire-report.plugin>${version.surefire}</version.surefire-report.plugin>
     <version.failsafe.plugin>${version.surefire}</version.failsafe.plugin>