Bump pmd.version from 6.7.0 to 6.8.0
Bump pmd.version from 6.7.0 to 6.8.0

Bumps `pmd.version` from 6.7.0 to 6.8.0.

Updates `pmd-core` from 6.7.0 to 6.8.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Commits](https://github.com/pmd/pmd/compare/pmd_releases/6.7.0...pmd_releases/6.8.0)

Updates `pmd-java` from 6.7.0 to 6.8.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Commits](https://github.com/pmd/pmd/compare/pmd_releases/6.7.0...pmd_releases/6.8.0)

Updates `pmd-xml` from 6.7.0 to 6.8.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Commits](https://github.com/pmd/pmd/compare/pmd_releases/6.7.0...pmd_releases/6.8.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
l0s/fernet-java8,l0s/fernet-java8