ci: automerge enterprise releases (#9650)

This allows autoqueue for update made by mergify-ci-bot for enterprise
releases.

Author: jd

.mergify.yml

@@ -92,6 +92,10 @@ queue_rules:
               - author=mergify-ci-bot
               - head = json-schema-types-sync
               - "title~=^chore: sync"
+          - and:
+              - author=mergify-ci-bot
+              - head = enterprise-releases-sync
+              - "title~=^chore: sync"
           - and:
               - author=mergify-ci-bot
               - head~=^clifus/