[CI] add dependency table sync verification
Sometimes version is being modified in `setup.py` but not updated in the autogenerated versions file `src/transformers/dependency_versions_table.py` and then all devs start getting this uncommitted change in their clone on `make fixup/style`. This PR adds a new make target to do the checking and adds it to the `check_code_quality` CI job.

Expecting it to fail in this PR initially as I didn't sync the table.

TODO: backout the setup.py version changes before merging.

@sgugger, @LysandreJik 
So now when the table is out of sync it fails with:

![snapshot_4](https://user-images.githubusercontent.com/10676103/123495350-3bed6d00-d5d8-11eb-8a88-272ac40a1ae4.png)

Let me know if this is good and I will re-test with when it's in sync.