_make_api_call: remove dead code (#1196)

pynamodb/connection/base.py

@@ -401,15 +401,7 @@ def _make_api_call(self, operation_name: str, operation_kwargs: Dict, settings:
             is_last_attempt_for_exceptions = i == self._max_retry_attempts_exception
 
             http_response = None
-            prepared_request = None
             try:
-                if prepared_request is not None:
-                    # If there is a stream associated with the request, we need
-                    # to reset it before attempting to send the request again.
-                    # This will ensure that we resend the entire contents of the
-                    # body.
-                    prepared_request.reset_stream()
-
                 # Create a new request for each retry (including a new signature).
                 prepared_request = self._create_prepared_request(request_dict, settings)