Created by: jburgess
Description of the PR
Removed the dashes from gradle version variables (jackson-databind-nullable-version) and replaced with underscores (jackson_databind_nullable_version)
See #3952
@bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04)