remove gh actions preset

Author: sunker

.github/renovate.json

@@ -2,6 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["github>grafana/grafana-community-team//renovate/renovate"],
   "ignorePresets": [
+    "github>grafana/grafana-renovate-config//presets/github-actions",
     "github>grafana/grafana-renovate-config//presets/base",
     "github>grafana/grafana-renovate-config//presets/automerge",
     "github>grafana/grafana-renovate-config//presets/labels",