renovate: Enable pre-commit module (#237)

This should provide automated update for pre-commit modules

.github/renovate.json5

@@ -14,6 +14,9 @@
     "ghcr.io/fluxcd/notification-controller",
     "ghcr.io/fluxcd/source-controller"
   ],
+  "pre-commit": {
+    "enabled": true
+  },
   "flux": {
     "fileMatch": [
       "cluster/.+\\.ya?ml$"