remove eventstream mix in until we get proper support

Author: jonathan343

packages/smithy-aws-core/src/smithy_aws_core/aio/protocols.py

@@ -229,7 +229,7 @@ def error_identifier(self) -> HTTPErrorIdentifier:
         return self._error_identifier
 
 
-class _AWSJSONClientProtocol(_EventStreamClientProtocolMixin, HttpClientProtocol):
+class _AWSJSONClientProtocol(HttpClientProtocol):
     _error_identifier: Final = AWSErrorIdentifier()
     _http_trait: Final = HTTPTrait({"method": "POST", "uri": "/"})