feat(node): drop support for node < 18, 19

BREAKING CHANGE: node versions < 18, 19 are no longer
supported.

Author: djcsdy

package.json

@@ -24,7 +24,7 @@
     "test": "ava"
   },
   "engines": {
-    "node": "^14 || ^16 || >=18"
+    "node": "^18 || >=20"
   },
   "dependencies": {
     "@softwareventures/array": "^3.10.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0",