chore(deps): update ghcr.io/stackitcloud/rag-template/admin-backend docker tag to v3

Author: renovate-bot

infrastructure/rag/values.yaml

@@ -264,7 +264,7 @@ adminBackend:
   image:
     repository: ghcr.io/stackitcloud/rag-template/admin-backend
     pullPolicy: Always
-    tag: "v2.3.0"
+    tag: "v3.1.0"
 
   command:
   - "poetry"