Fix for python3.9 support #1
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add _SpecialGenericAlias to GenericMeta to support typing.Dict and typing.List
type(typing.Dict)andtype(typing.List)return_SpecialGenericAliasin python3.9 (compared to_GenericAliasin python<=3.8)Need to add it to
GenericMetaso thatif original_isinstance(cls, GenericMeta):can catch it (dataclasses_serialization/serializer_base/typing.py:64)