rulesets/nixpkgs: enable merge queue for staging-25.11

As part of the staging branchoff.

Author: wolfgangwalther

rulesets/nixpkgs/require-merge-queue-except-periodic-merges.json

@@ -14,7 +14,9 @@
         "refs/heads/staging-next",
         "refs/heads/staging-25.05",
         "refs/heads/staging-next-25.05",
-        "refs/heads/staging-nixos"
+        "refs/heads/staging-nixos",
+        "refs/heads/staging-next-25.11",
+        "refs/heads/staging-25.11"
       ]
     }
   },