Update update-assets.yml

Fix write permission

Author: crynobone

.github/workflows/update-assets.yml

@@ -8,6 +8,9 @@ on:
       - '/src/Illuminate/Foundation/resources/exceptions/renderer/package-lock.json'
   workflow_dispatch:
 
+permissions:
+  contents: write
+
 jobs:
   update:
     runs-on: ubuntu-latest