[AIRFLOW-6717] Remove non-existent field from templated_fields (#7340)

Author: kaxil

airflow/providers/google/cloud/operators/cloud_memorystore.py

@@ -682,7 +682,6 @@ class CloudMemorystoreScaleInstanceOperator(BaseOperator):
 
     template_fields = (
         "memory_size_gb",
-        "instance",
         "location",
         "instance_id",
         "project_id",