Bump jmock.version from 2.11.0 to 2.12.0
Bump jmock.version from 2.11.0 to 2.12.0

Bumps `jmock.version` from 2.11.0 to 2.12.0.

Updates `jmock` from 2.11.0 to 2.12.0
- [Release notes](https://github.com/jmock-developers/jmock-library/releases)
- [Commits](https://github.com/jmock-developers/jmock-library/compare/2.11.0...2.12.0)

Updates `jmock-junit4` from 2.11.0 to 2.12.0
- [Release notes](https://github.com/jmock-developers/jmock-library/releases)
- [Commits](https://github.com/jmock-developers/jmock-library/compare/2.11.0...2.12.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
apache/isis,apache/isis,apache/isis,apache/isis,apache/isis,apache/isis