Add gjs to prettier

Author: kategengler

.prettierrc.js

@@ -1,9 +1,10 @@
 'use strict';
 
 module.exports = {
+  plugins: ['prettier-plugin-ember-template-tag'],
   overrides: [
     {
-      files: '*.{js,ts}',
+      files: '*.{js,ts,gjs,gts}',
       options: {
         singleQuote: true,
       },