Update .mergify.yml (#2236)

Author: lcawl

.mergify.yml

@@ -25,7 +25,7 @@ pull_request_rules:
  assignees:
  - "{{ author }}"
  branches:
- - "8.4"
+ - "8.5"
  title: "[{{ destination_branch }}] {{ title }} (backport #{{ number }})"
  labels:
  - backport