MAINT: Adapt npt._GenericAlias to Python 3.11 types.GenericAlias changes #21660
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Backport of #21605.
Follow up on #21543, xref #21308
Adapt
npt._GenericAlias
to the various PEP 646-related changes introduced intypes.GenericAlias
, notably the introduction of three new attributes and/or methods:__iter__
__unpacked__
__typing_unpacked_tuple_args__
Note that
types.GenericAlias
still seems to updated on a regular basis in the current 3.11 dev cycle (so more changes may or may not be necessary in the future), but this should be enough to get things running again for #21308.