Bump gmavenplus-plugin from 1.12.0 to 1.12.1

Bumps [gmavenplus-plugin](https://github.com/groovy/GMavenPlus) from 1.12.0 to 1.12.1.
- [Release notes](https://github.com/groovy/GMavenPlus/releases)
- [Commits](https://github.com/groovy/GMavenPlus/compare/1.12.0...1.12.1)

Signed-off-by: dependabot[bot] <support@github.com>
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