ci: pin explicit permissions on website deploy job

Author: CrickCrock28

.github/workflows/website.yml

@@ -30,6 +30,8 @@ jobs:
     name: Deploy to GitHub Pages
     if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4