fix(actions): pin actions

actions.json

@@ -1,5 +1,8 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "helpers:pinGitHubActionDigests"
+  ],
   "packageRules": [
     {
       "addLabels": [
@@ -161,8 +164,6 @@
       "allowedVersions": "<27.0.0",
       "automerge": true,
       "enabled": true,
-      "groupName": "actions",
-      "groupSlug": "actions",
       "matchDatasources": [
         "github-actions"
       ],