Update update-contributors.yml

Author: mrubens

.github/workflows/update-contributors.yml

@@ -11,6 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write  # Needed for pushing changes
+      pull-requests: write  # Needed for creating PRs
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
@@ -55,4 +56,4 @@ jobs:
             Automated update of contributors list in README.md
             
             This PR was created automatically by a GitHub Action workflow.
-          base: main
+          base: main