Update dependency org.apache.maven.plugins:maven-javadoc-plugin to v3.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.maven.plugins:maven-javadoc-plugin (source)	3.1.1 → 3.12.0

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Configuration

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[coveralls]

Coverage remained the same at 30.882% when pulling 1738fc3 on renovate/org.apache.maven.plugins-maven-javadoc-plugin-3.x into 8ccc945 on master.

[coveralls]

Coverage remained the same at 30.882% when pulling 1738fc3 on renovate/org.apache.maven.plugins-maven-javadoc-plugin-3.x into 8ccc945 on master.