feat(node): update Node.js engine requirement to version 20

BREAKING CHANGE: requires node 20

Author: DiegoRBaquero

package.json

@@ -43,7 +43,7 @@
     "xtend": "4.0.2"
   },
   "engines": {
-    "node": ">=16"
+    "node": ">=20"
   },
   "exports": {
     "./bin/cmd.js": "./bin/cmd.js"