[issue37697] Incorporate changes from importlib_metadata 0.19

[Jason R. Coombs]

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

Okay, I think the issue was that I had failed to `make regen-importlib`. After doing that, the tests are passing. PR incoming.

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<https://bugs.python.org/issue37697>
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