Merge pull request #5415 from eXist-db/dependabot/maven/org.apache.maven.plugins-maven-site-plugin-3.20.0

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

Author: dizzzz

exist-parent/pom.xml

@@ -884,7 +884,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.12.1</version>
+                    <version>3.20.0</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>