[MPMD-302] - Upgrade to PMD 6.25.0

[pzygielo]

With Version 3.14.0 still unreleased I believe this change could be covered by existing MPMD-302.

[adangel]

@pzygielo sorry, already done :) -> 98cf3a5

[adangel]

Then plan is, that we add support for JDK15 with the next PMD version (6.27.0). I think, after that, it would be a good time to also create a new release of m-pmd-p. wdyt?

[pzygielo]

@adangel Thanks for checking.
As for new release - I myself sometimes use explicit m-pmd-p goals from commandline (I mean - when plugin is not configured in project). That's why I PRed PMD updates 😄 (as I see no way to override pmd version in such case). So new official plugin will for sure be welcomed by me.

[jira-importer]

Resolve #331

[jira-importer]

Resolve #331