Removed redundant CI workflow
Removed redundant CI workflow

We don't need an explicit workflow for wrapper validation. We already run this as a step in the build:

https://github.com/mockito/mockito/runs/1380756176?check_suite_focus=true#step:4:1
mockito/mockito,mockito/mockito,bric3/mockito,bric3/mockito,mockito/mockito,ze-pequeno/mockito,ze-pequeno/mockito,bric3/mockito