[AIRFLOW-4246] RBAC Flask-OAuthlib breaks due to dependencies

[PaulW]

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Description

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  Installing Flask-OAuthlib results in unresolveable dependencies due to updates to the following dependencies:
  oauthlib
requests-oauthlib

Pinning these versions allows Flask-OAuthlib to work as expected. This has been pinned so including both google_auth and github_enterprise will install the same packages as defined in flask_oauth.

Tests

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Code Quality

• Passes flake8

[ashb]

My that's quite the version specificiation! Where did it come from?

[PaulW]

I've based it on the master branch of the Flask-OAuthlib git repository:

https://github.com/lepture/flask-oauthlib/blob/9e6f152a5bb360e7496210da21561c3e6d41b0e1/setup.py#L44-L47

There were 2 commits to pin these versions:

lepture/flask-oauthlib@bd06c64
lepture/flask-oauthlib@1379c6b

Similar to #5036, we can unpin these once a new release of Flask-OAuthlib is released which includes the above changes.