Fix action permissions

.github/workflows/update-translation-strings.yml

@@ -3,7 +3,7 @@ name: Update translation strings
 on: workflow_dispatch
 
 permissions:
-  contents: read
+  contents: write
 
 jobs:
   makemessages:
@@ -35,4 +35,5 @@ jobs:
       uses: EndBug/add-and-commit@v9
       with:
         add: 'netbox/translations/'
+        default_author: github_actions
         message: 'Update source translation strings'