Bump org.apache.maven.plugins:maven-site-plugin from 3.12.1 to 3.21.0 in /mvn-scalaxb#674

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dependabot/maven/mvn-scalaxb/org.apache.maven.plugins-maven-site-plugin-3.21.0eed3si9n/scalaxb:dependabot/maven/mvn-scalaxb/org.apache.maven.plugins-maven-site-plugin-3.21.0Copy head branch name to clipboard