Update ownership.yaml

Author: jianghao0718

ownership.yaml

@@ -1,6 +1,13 @@
 ---
 version: 1
 ownership:
+- name: backup-utils-private
+  long_name: backup-utils-private
+  description: backup-utils-private is the private fork of backup-utils
+  kind: code
+  repo: https://github.com/github/backup-utils-private
+  qos: critical
+  component_of: ghes-infra
 - name: backup-utils
   long_name: backup-utils
   description: backup-utils is backup and restore tooling for Github enterprise server