[issue14678] Update zipimport to support importlib.invalidate_caches()

[Brett Cannon]

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

It looks like it hasn't been done, else https://github.com/python/cpython/blob/master/Lib/zipimport.py would have some definition of a invalidate_caches() method. And specifically the finder lacks that method so it can be called by https://github.com/python/cpython/blob/c705fd1e89ccb8f6d414ec817b4616546147d877/Lib/importlib/_bootstrap_external.py#L1245-L1257.

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