chore(deps): pin dependency @types/qunit to 2.19.12 (#2921)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/test-app/package.json

@@ -32,7 +32,7 @@
     "@glint/environment-ember-template-imports": "1.5.0",
     "@tsconfig/ember": "3.0.8",
     "@types/ember__service": "4.0.9",
-    "@types/qunit": "^2.19.12",
+    "@types/qunit": "2.19.12",
     "@typescript-eslint/eslint-plugin": "8.19.0",
     "@typescript-eslint/parser": "8.19.0",
     "body-parser": "1.20.3",