chore!: drop support for Node.js 18

Author: aduh95

package.json

@@ -30,7 +30,7 @@
     "core-validate-commit": "./bin/cmd.js"
   },
   "engines": {
-    "node": "^18.18.0 || >=20.10.0"
+    "node": ">=20.19.0"
   },
   "author": "Evan Lucas <evanlucas@me.com>",
   "repository": {