Bump maven-pmd-plugin from 3.11.0 to 3.12.0 (#26)
Bump maven-pmd-plugin from 3.11.0 to 3.12.0 (#26)

Bumps [maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.11.0 to 3.12.0.
<details>
<summary>Commits</summary>

- [`cbcda4e`](https://github.com/apache/maven-pmd-plugin/commit/cbcda4e50d0694a5cc6e63427f9d1da53d624b9a) [maven-release-plugin] prepare release maven-pmd-plugin-3.12.0
- [`e94be14`](https://github.com/apache/maven-pmd-plugin/commit/e94be14b84c6e3f41561859347221c259cf8d0f6) [MPMD-284] Upgrade parent to 33
- [`7649a42`](https://github.com/apache/maven-pmd-plugin/commit/7649a42a108c19481d22b5c8cdf2295d62cd3693) [MPMD-281] Display found violations grouped by priority
- [`953adf0`](https://github.com/apache/maven-pmd-plugin/commit/953adf07da02e08ce4be8dadf2013fa8f8cd5276) [MPMD-277] Plugin tries to download local submodules from repo
- [`70ad1f0`](https://github.com/apache/maven-pmd-plugin/commit/70ad1f0a9ae3a00f05509148ad75f3832962884e) [MPMD-282] Add rule name to HTML report
- [`67ee139`](https://github.com/apache/maven-pmd-plugin/commit/67ee139dbd3aa342859b116b3e66c618eca340e0) [MPMD-276] Rename test files for cpd's excludeFromFailureFile
- [`a9c5840`](https://github.com/apache/maven-pmd-plugin/commit/a9c5840bc258318e0e5f6c3c79db865cb9cf3f1e) [MPMD-279] Improve documentation of maxAllowedViolations
- [`119218c`](https://github.com/apache/maven-pmd-plugin/commit/119218c60db52015142e5276434832eea4e1879e) [MPMD-280] maven-pmd-plugin does not support targetJdk 12
- [`9d5ef9b`](https://github.com/apache/maven-pmd-plugin/commit/9d5ef9bac7a2c0d9082d93cff01da2f6a6aadd7a) [MPMD-280] maven-pmd-plugin does not support targetJdk 12
- [`3171f7d`](https://github.com/apache/maven-pmd-plugin/commit/3171f7d33958b495ab1857314a9361f8e06182ab) [MPMD-275] Upgrade to PMD 6.13.0
- Additional commits viewable in [compare view](https://github.com/apache/maven-pmd-plugin/compare/maven-pmd-plugin-3.11.0...maven-pmd-plugin-3.12.0)
</details>
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joschi/jackson-datatype-threetenbp