Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add contribex to github template owners **What this PR does / why we need it**: The `.github/` folder doesn't have an OWNERS file. These templates fall under contribex, so this would add an OWNERS file to this folder. **Release note**: ```release-note NONE ```