Update pmd.version to v7 (major)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
net.sourceforge.pmd:pmd-core (source)	6.55.0 -> 7.7.0
net.sourceforge.pmd:pmd-xml (source)	6.55.0 -> 7.7.0
net.sourceforge.pmd:pmd-java (source)	6.55.0 -> 7.7.0

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