chore(ci): use common renovate bot configuration.

Updates the renovate bot configuration to uses the default configuration
used by all the major Kubewarden components.

Signed-off-by: José Guilherme Vanz <[email protected]>

Author: jvanz

renovate.json

@@ -1,8 +1,7 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
-    "config:recommended",
-    "helpers:pinGitHubActionDigests"
+    "github>kubewarden/github-actions//renovate-config/default"
   ],
   "ignoreDeps": [
     "sigs.k8s.io/wg-policy-prototypes"