assertDictContainsSubset was removed in Python 3.11

[tirkarthi]

Ref : python/cpython#28268

notebook/notebook/services/contents/tests/test_manager.py

Line 386 in 2cfff07

self.assertDictContainsSubset(

[JasonWeill]

Recommended alternatives on this StackOverflow thread: https://stackoverflow.com/questions/9323749/how-to-check-if-one-dictionary-is-a-subset-of-another-larger-dictionary