Merge pull request #14 from ember-cli/trailing-commas

update prettier and add a test to show trailing commas are preserved

Author: mansona

package.json

@@ -41,17 +41,16 @@
     "@babel/core": "^7.16.10",
     "@babel/plugin-syntax-decorators": "^7.16.7",
     "@babel/plugin-transform-typescript": "^7.16.8",
-    "prettier": "^2.5.1"
+    "prettier": "^3.8.1"
   },
   "devDependencies": {
     "@types/babel__core": "^7.1.18",
     "@types/babel__traverse": "^7.20.6",
-    "@types/prettier": "^2.0.0",
     "@typescript-eslint/eslint-plugin": "^5.10.0",
     "@typescript-eslint/parser": "^5.10.0",
     "eslint": "^8.7.0",
-    "eslint-config-prettier": "^8.3.0",
-    "eslint-plugin-prettier": "^4.0.0",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.5",
     "release-plan": "^0.9.0",
     "rimraf": "^3.0.2",
     "typescript": "^4.5.5",