Update dependency org.apache.maven.plugins:maven-pmd-plugin to v3.28.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.maven.plugins:maven-pmd-plugin (source)	3.13.0 → 3.28.0

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[coveralls]

Coverage decreased (-0.2%) to 30.732% when pulling 4b35c91 on renovate/org.apache.maven.plugins-maven-pmd-plugin-3.x into 8ccc945 on master.

[coveralls]

Coverage decreased (-0.2%) to 30.732% when pulling 4b35c91 on renovate/org.apache.maven.plugins-maven-pmd-plugin-3.x into 8ccc945 on master.