Fix another release workflow step (#13324)

Co-authored-by: Lauri Tulmin <[email protected]>

Author: trask

.github/workflows/release.yml

@@ -269,6 +269,8 @@ jobs:
                        --base main
 
   update-apidiff-baseline-to-released-version:
+    permissions:
+      contents: write # for git push to PR branch
     runs-on: ubuntu-latest
     needs:
       - release