chore: update node engine requirement to >=20 (#242)

Author: shazron

package.json

@@ -39,7 +39,7 @@
     "stdout-stderr": "^0.1.9"
   },
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "main": "src/index.js",
   "files": [