ci: have renovate group GHA workflow updates (#388)

This should make it a bit easier to manage

Author: G-Rath

.github/renovate.json

@@ -6,5 +6,11 @@
     "schedule": ["after 1am and before 2am on monday"]
   },
   "rangeStrategy": "replace",
-  "postUpdateOptions": ["npmDedupe"]
+  "postUpdateOptions": ["npmDedupe"],
+  "packageRules": [
+    {
+      "matchFileNames": [".github/**"],
+      "groupName": "workflows"
+    }
+  ]
 }