Enable assumeImmutableResults in releases

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/338443

app/assets/javascripts/releases/mount_show.js

@@ -6,7 +6,12 @@ import ReleaseShowApp from './components/app_show.vue';
 Vue.use(VueApollo);
 
 const apolloProvider = new VueApollo({
-  defaultClient: createDefaultClient(),
+  defaultClient: createDefaultClient(
+    {},
+    {
+      assumeImmutableResults: true,
+    },
+  ),
 });
 
 export default () => {