Update Node.js to v24 (#58)

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

Author: renovate[bot]

functions/package-lock.json

@@ -11,7 +11,7 @@
     "logs": "firebase functions:log"
   },
   "engines": {
-    "node": "22"
+    "node": "24"
   },
   "main": "lib/handlePlayNotification.js",
   "dependencies": {