Bump maven-javadoc-plugin from 2.9.1 to 3.1.1#19

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dependabot/maven/org.apache.maven.plugins-maven-javadoc-plugin-3.1.1MutabilityDetector/MutabilityDetector4FindBugs:dependabot/maven/org.apache.maven.plugins-maven-javadoc-plugin-3.1.1Copy head branch name to clipboard