chore(deps): update dependency org.apache.maven.plugins:maven-site-plugin to v3.20.0#1243

renovate-bot wants to merge 1 commit intoGoogleCloudPlatform:mainGoogleCloudPlatform/getting-started-java:mainfrom

renovate-bot:renovate/org.apache.maven.plugins-maven-site-plugin-3.xrenovate-bot/getting-started-java:renovate/org.apache.maven.plugins-maven-site-plugin-3.xCopy head branch name to clipboard