feat: update required min node version to 20

BREAKING CHANGE: Minimum required node version is 20

Author: tagoro9

package.json

@@ -21,7 +21,7 @@
     "prettier": "3.4.2"
   },
   "engines": {
-    "node": ">= 14"
+    "node": ">= 20"
   },
   "homepage": "https://github.com/open-turo/eslint-config-typescript#readme",
   "license": "MIT",