Bump maven-javadoc-plugin from 2.9.1 to 3.1.0#12

dependabot-preview[bot] wants to merge 1 commit intomasterMutabilityDetector/MutabilityDetector4FindBugs:masterfrom

dependabot/maven/org.apache.maven.plugins-maven-javadoc-plugin-3.1.0MutabilityDetector/MutabilityDetector4FindBugs:dependabot/maven/org.apache.maven.plugins-maven-javadoc-plugin-3.1.0Copy head branch name to clipboard