python: fix type annotation for the _metadata field (#27251)

It's a tuple with many MetadatumType's.

Co-authored-by: francisco souza <fsouza@users.noreply.github.com>
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francisco souza 2021-09-13 19:25:53 -04:00 committed by GitHub
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@ -165,7 +165,7 @@ class Call:
_loop: asyncio.AbstractEventLoop
_code: grpc.StatusCode
_cython_call: cygrpc._AioCall
_metadata: Tuple[MetadatumType]
_metadata: Tuple[MetadatumType, ...]
_request_serializer: SerializingFunction
_response_deserializer: DeserializingFunction