Set packageManager upgrade pnpm

Author: NullVoxPopuli

package.json

@@ -16,6 +16,7 @@
     "prettier-plugin-ember-template-tag": "^1.1.0",
     "release-plan": "^0.9.0"
   },
+  "packageManager": "pnpm@9.13.2",
   "pnpm": {
     "overrides": {
       "@types/eslint": "^7.0.0"