chore: update node engine requirement to >=20 (#159)

Author: shazron

package.json

@@ -50,7 +50,7 @@
     "tree-kill": "^1.2.2"
   },
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "files": [
     "bin/run",