Bump groovy-all from 2.5.11 to 2.5.12
Bump groovy-all from 2.5.11 to 2.5.12

Bumps [groovy-all](https://github.com/apache/groovy) from 2.5.11 to 2.5.12.
- [Release notes](https://github.com/apache/groovy/releases)
- [Commits](https://github.com/apache/groovy/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
mkutz/spock-testing-workshop