update permissions

Author: ota-meshi

.github/workflows/cron.yml

@@ -4,6 +4,10 @@ on:
     schedule:
         - cron: 0 0 * * 0
 
+permissions:
+    contents: write
+    pull-requests: write
+
 jobs:
     update-unicode-alias:
         name: update-unicode-alias