Fix permissions for calling update-protobuf job (#309)

Signed-off-by: rulex123 <erica.manno@gmail.com>
Co-authored-by: Matthieu MOREL <matthieu.morel35@gmail.com>

Author: rulex123

.github/workflows/scheduled.yml

@@ -13,6 +13,8 @@ jobs:
     uses: ./.github/workflows/compare-envoy-versions.yml
 
   call-update-protobuf:
+    permissions:
+      pull-requests: write
     needs: call-compare-envoy-versions-workflow
     if: ${{ needs.call-compare-envoy-versions-workflow.outputs.target-version != 'noop' }}
     uses: ./.github/workflows/update-protobuf.yml

.github/workflows/update-protobuf.yml

@@ -14,7 +14,6 @@ on:
 jobs:
   update-protobuf:
     permissions:
-      contents: write
       pull-requests: write
     runs-on: ubuntu-latest
     steps: