[3.10] bpo-46581: Propagate private vars via _GenericAlias.copy_with (GH-31061) #31821
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(Cherry-picked from 32bf359.)
GH-26091 added the _typevar_types and _paramspec_tvars instance
variables to _GenericAlias. However, they were not propagated
consistently. This commit addresses the most prominent deficiency
identified in bpo-46581 (namely their absence from
_GenericAlias.copy_with), but there could be others.
Co-authored-by: Ken Jin 28750310+Fidget-Spinner@users.noreply.github.com
Co-authored-by: Serhiy Storchaka storchaka@gmail.com