chore: bump to node 20

Author: pionxzh

package.json

@@ -9,7 +9,7 @@
   "license": "MIT",
   "homepage": "https://github.com/pionxzh/wakaru",
   "engines": {
-    "node": ">=18.0.0"
+    "node": ">=20.0.0"
   },
   "scripts": {
     "build": "turbo run build",
@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "@pionxzh/eslint-config": "^1.0.1",
-    "@types/node": "^18.19.31",
+    "@types/node": "^20.12.7",
     "@vitest/coverage-v8": "^1.5.0",
     "@vitest/ui": "^1.5.0",
     "eslint": "^8.57.0",