build(deps): bump org.apache.maven.plugins:maven-site-plugin from 3.12.1 to 3.21.0#5

dependabot[bot] wants to merge 1 commit intomaincombostrap/doc-exec:mainfrom

dependabot/maven/org.apache.maven.plugins-maven-site-plugin-3.21.0combostrap/doc-exec:dependabot/maven/org.apache.maven.plugins-maven-site-plugin-3.21.0Copy head branch name to clipboard