DeprecationWarning: assertDictContainsSubset is deprecated

[irtazaakram]

The assertDictContainsSubset method was deprecated in version 3.2 and removed in version 3.11.

Reference: python/cpython#28268

Example usage in edx-platform:

edx-platform/cms/djangoapps/api/v1/tests/test_views/test_course_runs.py

Line 289 in 03a8f5d

self.assertDictContainsSubset({'team': ['Course team user does not exist']}, response.data)

Example replacement:
python/cpython#28268 (comment)

[dwong2708]

Hi @irtazaakram , This ticket appears to be resolved and can be closed. The fix is available on the master branch: https://github.com/openedx/edx-platform/blob/master/cms/djangoapps/api/v1/tests/test_views/test_course_runs.py#L289