refactor: drop support for Node.js <18

BREAKING CHANGE

The support versions are `^18.19.1 || ^20.11.1 || >=22.0.0`

Author: ahnpnl

package.json

@@ -4,7 +4,7 @@
   "description": "Jest preset configuration for Angular projects",
   "license": "MIT",
   "engines": {
-    "node": "^14.15.0 || >=16.10.0"
+    "node": "^18.19.1 || ^20.11.1 || >=22.0.0"
   },
   "main": "build/index.js",
   "typings": "build/index.d.ts",