chore(deps): update pnpm to v9.15.5

Author: renovate[bot]

package.json

@@ -4,7 +4,7 @@
   "description": "This is a free quiz site made for developers by freeCodeCamp",
   "version": "0.1.0",
   "private": true,
-  "packageManager": "[email protected].4",
+  "packageManager": "[email protected].5",
   "dependencies": {
     "@testing-library/jest-dom": "^6.4.6",
     "@testing-library/react": "^16.0.0",