gh-135532: use defining_class
for copying BLAKE-2 and SHA-3 objects
#135838
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Performance are left untouched even if we're not using a
METH_NOARGS
. I tried to remove thedefining_class
in existing code but it didn't help. If we were to allow subclassing in the future, this saves some work as we would only need to touch constructors and not the methods themselves.