Update http/headers/Idempotency-Key.json

Co-authored-by: Claas Augner <[email protected]>

Author: hamishwillee

http/headers/Idempotency-Key.json

@@ -35,7 +35,7 @@
           },
           "status": {
             "experimental": true,
-            "standard_track": true,
+            "standard_track": false,
             "deprecated": false
           }
         }