chore(deps-dev): bump org.apache.maven.plugins:maven-site-plugin from 3.12.1 to 3.21.0#13

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dependabot/maven/org.apache.maven.plugins-maven-site-plugin-3.21.0g4dpz/predict4java:dependabot/maven/org.apache.maven.plugins-maven-site-plugin-3.21.0Copy head branch name to clipboard