[issue42134] Raise ImportWarning when falling back to find_module()

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

> would you accept a PR that changes the changelog entry to contain the ".find_spec() not found; falling back to find_module()" message, for better search-ability?

Sure!

> Also, could you please explain how to migrate to find_spec() in https://docs.python.org/3.10/whatsnew/3.10.html#porting-to-python-3-10 ? I'd do that, but I don't know yet what is the proper way.

The problem is it will possibly vary from class to class. You can probably get pretty far with https://docs.python.org/3/library/importlib.html#importlib.util.spec_from_file_location or https://docs.python.org/3/library/importlib.html#importlib.util.spec_from_loader depending.

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