Fix DeprecationWarning when accessing collections.abc classes via collections #6268
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Description
Since the
Mapping
andMutableMapping
classes will no longer be available to import directly from thecollections
module in Python 3.8, we should create and use aliases for them in the compat module. I noticed this due to deprecation warnings appearing in tests in a project using rest framework that I ran on Python 3.7.This builds on the work started in #6154 and removes the remaining references to the abstract base classes that are used in the project.