[issue44771] Adopt changes from importlib_resources 5.2

[Jason R. Coombs]

Jason R. Coombs <jaraco at jaraco.com> added the comment:

In [this comment](https://github.com/python/importlib_resources/pull/221#discussion_r679124389), I did more analysis and assuaged my own concerns about the implementation. Everything seems to be working as intended, thanks to the strong work by FFY00.

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