[3.9] bpo-45678: Fix singledispatchmethod classmethod/staticmethod bug #29394
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This PR fixes a bug in the 3.9 branch where
functools.singledispatchmethoddid not properly wrap attributes such as__name__,__doc__and__module__of the target method. It alsobackports tests already merged into the 3.11 and 3.10 branches in #29328 and
#29390.
https://bugs.python.org/issue45678