DEV: Switch to use pnpm (#104)

Author: tyb-talks

package.json

@@ -1,10 +1,11 @@
 {
   "private": true,
   "devDependencies": {
-    "@discourse/lint-configs": "1.3.9",
+    "@discourse/lint-configs": "1.3.10",
     "ember-template-lint": "6.0.0",
-    "eslint": "8.57.0",
-    "prettier": "2.8.8"
+    "eslint": "8.57.1",
+    "prettier": "2.8.8",
+    "@babel/plugin-proposal-decorators": "^7.25.7"
   },
   "engines": {
     "node": ">= 18",