OAF-check looks like failing even when it creates a new PR successfully

[annashamray]

When there is a new version of OAF oaf-check workflow fails on the job Check git diff even if the new PR is created

It looks like the reason for it is this --exit-code line:

      - name: Check git diff
        run: git diff --exit-code -- requirements/*.txt

I think it's confusing and if the workflow doesn't have some internal error it should be green