Update concurrently to latest

Author: mkszepp

files/package.json

@@ -7,7 +7,7 @@
   "packageManager": "<%= pnpm ? '[email protected]' : '[email protected]' %>",
   "devDependencies": {<% if (typescript) { %>
     "@glint/core": "^1.2.1",<% } %>
-    "concurrently": "^8.2.0",
+    "concurrently": "^9.1.2",
     "prettier": "^3.0.3",
     "prettier-plugin-ember-template-tag": "^2.0.2"
   },