ci(renovate): switch to shared configs (#29)

Reviewed-on: #29
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

renovate.json

@@ -1,9 +1,4 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "packageRules": [
-    {
-      "matchUpdateTypes": ["patch", "minor"],
-      "groupName": "devDependencies (non-major)"
-    }
-  ]
+  "extends": ["local>t.behrendt/renovate-configs:action"]
 }