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39fcf8bd - benchmarks/aggregate: use typing.Dict[] instead of builtins.dict[] (#6047)

benchmarks/aggregate: use typing.Dict[] instead of builtins.dict[] (#6047) builtins.dict[] added support for subscripting in Python 3.9: https://docs.python.org/3/library/typing.html#typing.Dict Our CI, however, runs Python 3.8.