[issue42133] Update the stdlib to fall back to __spec__.parent if __loader__ isn't defined

[Brett Cannon]

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


New changeset 825ac383327255d38b69a753e5e41710bb3ed010 by Brett Cannon in branch 'master':
bpo-42133: update parts of the stdlib to fall back to `__spec__.loader` when `__loader__` is missing (#22929)
https://github.com/python/cpython/commit/825ac383327255d38b69a753e5e41710bb3ed010


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