Add pull-requests write permission to workflow

Signed-off-by: Jorge C. <jacortez_94@hotmail.com>

Author: JorchCortez

.github/workflows/update-contributors.yml

@@ -12,6 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write
+      pull-requests: write
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4