Set assumeImmutableResults to true

ee/app/assets/javascripts/epics_list/epics_list_bundle.js

@@ -18,7 +18,12 @@ export default function initEpicsList({ mountPointSelector }) {
   }
 
   const apolloProvider = new VueApollo({
-    defaultClient: createDefaultClient(),
+    defaultClient: createDefaultClient(
+      {},
+      {
+        assumeImmutableResults: true,
+      },
+    ),
   });
 
   const {