chore(config): migrate config .github/renovate.json (#138)

Co-authored-by: Renovate Bot <[email protected]>

Author: stackit-pipeline

.github/renovate.json

@@ -9,9 +9,9 @@
     ],
     "enabledManagers": [
         "github-actions",
-        "regex"
+        "custom.regex"
     ],
-    "regexManagers": [
+    "customManagers": [
         {
             "customType": "regex",
             "fileMatch": [
@@ -35,4 +35,4 @@
             "versioningTemplate": "semver"
         }
     ]
-}
+}