Fix: Add permissions to check-filesize workflow

.github/workflows/check-filesize.yml

@@ -12,6 +12,9 @@ permissions:
 jobs:
   check-size:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4