ci(renovate): Fix custom integration with upstream flux

renovate.json

@@ -8,14 +8,7 @@
   ],
   "prConcurrentLimit": 10,
   "semanticCommits": "enabled",
-  "regexManagers": [
-    {
-      "fileMatch": ["release.yaml$"],
-      "matchStrings": [
-        "# renovate: helmRepo=(?<registryUrl>.*?) depName=(?<depName>.*?)\\n\\s+version: \"?'?(?<currentValue>[^\"]+?)\"?'?\\s"
-      ],
-      "datasourceTemplate": "helm",
-      "versioningTemplate": "semver"
-    }
-  ]
+  "flux": {
+    "fileMatch": ["\\.yaml$"]
+  }
 }