chore(deps): update dependency org.apache.maven.plugins:maven-site-plugin to v3.20.0 (#3582)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -52,7 +52,7 @@
         <versions-maven-plugin.version>2.17.1
         </versions-maven-plugin.version> <!-- because of https://github.com/mojohaus/versions/issues/855 -->
         <maven-clean-plugin.version>3.4.0</maven-clean-plugin.version>
-        <maven-site-plugin.version>3.12.1</maven-site-plugin.version>
+        <maven-site-plugin.version>3.20.0</maven-site-plugin.version>
         <maven-dependency-plugin.version>3.7.1</maven-dependency-plugin.version>
         <maven-deploy-plugin.version>3.1.2</maven-deploy-plugin.version>
         <maven-enforcer-plugin.version>3.5.0</maven-enforcer-plugin.version>