chore: define node engines

Because of dependency of `@achrinza/node-ipc`, its config node engine not allow > 17. so should define a lts node version to tell vercel

Errors below:
`error @achrinza/node-ipc@9.2.2: The engine "node" is incompatible with this module. Expected version "8 || 10 || 12 || 14 || 16 || 17". Got "18.12.1"`

package.json

@@ -22,6 +22,9 @@
     "netease_api:run": "npx NeteaseCloudMusicApi"
   },
   "main": "background.js",
+  "engines": {
+    "node": "14 || 16"
+  },
   "dependencies": {
     "@unblockneteasemusic/rust-napi": "^0.4.0",
     "NeteaseCloudMusicApi": "^4.8.7",