Give write access to backport action explicitly (#61626)

Author: hoyosjs

.github/workflows/backport.yml

@@ -3,6 +3,11 @@ on:
   issue_comment:
     types: [created]
 
+permissions:
+  contents: write
+  issues: read
+  pull-requests: write
+
 jobs:
   backport:
     if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/backport to')