[issue18200] Update stdlib to use ModuleNotFoundError

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7769c4d72806 by Brett Cannon in branch 'default':
Issue #18200: Back out usage of ModuleNotFoundError (8d28d44f3a9a)
http://hg.python.org/cpython/rev/7769c4d72806

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<http://bugs.python.org/issue18200>
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