Grant Create PR workflow pull-request write perms. (#8846)

Our staging release workflow failed to create a Version Packages PR. Grant the PR creation workflow `pull-request` `write` permissions.

Author: DellaBitta

.github/workflows/release-pr.yml

@@ -24,6 +24,8 @@ jobs:
   release:
     name: Create Release PR
     runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
     if: ${{ !startsWith(github.event.head_commit.message, 'Version Packages (#') }}
     steps:
       - name: Checkout Repo