Groovy Patch Release against 3.1.12 spotbugs

This release is against spotbugs 3.1.12 and includes a patch to groovy 3.0.0 beta 2. This ensures that java warnings on newer jdks are no longer presented to the user of spotbugs maven plugin.

This release additionally contains updated third party software and fixes to ensure our site pages are properly released.

Note: While support for spotbugs with source paths has been included here, that feature aligns with spotbugs 4.0.0. In order to utilize the feature, you will need to override spotbugs with the most recent spotbugs beta release '4.0.0-beta3'. See here for details on support.