build(package): set minimal node version in engines field to v20

BREAKING CHANGE: Drop support for NodeJS v18

Author: wolfy1339

package.json

@@ -85,6 +85,6 @@
     "provenance": true
   },
   "engines": {
-    "node": ">= 18"
+    "node": ">= 20"
   }
 }