[gcp][fix]: Duplicate checksum error in sql service (#2166)

plugins/gcp/fix_plugin_gcp/resources/sqladmin.py

@@ -1,6 +1,6 @@
 import logging
 from datetime import datetime
-from typing import ClassVar, Dict, Optional, List, Type
+from typing import Any, ClassVar, Dict, Optional, List, Tuple, Type
 
 from attr import define, field
 
@@ -1104,5 +1104,8 @@ def connect_in_graph(self, builder: GraphBuilder, source: Json) -> None:
         if self.instance:
             builder.add_edge(self, reverse=True, clazz=GcpSqlDatabaseInstance)
 
+    def _keys(self) -> Tuple[Any, ...]:
+        return tuple(list(super()._keys()) + [self.instance])
+
 
 resources: List[Type[GcpResource]] = [GcpSqlDatabaseInstance]