Add additional permissions for backport workflow (#10269) (#10270)

(cherry picked from commit 1b2f300)

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

Author: github-actions[bot]

.github/workflows/backport.yml

@@ -6,8 +6,9 @@ on:
       - labeled
 
 permissions:
-  pull-requests: write
+  actions: write
   contents: write
+  pull-requests: write
 
 jobs:
   backport: