package.json: update node and npm versions

Supported on current LTS versions of Node.js.

See: https://nodejs.org/en/about/previous-releases

Author: alanorth

package-lock.json

@@ -232,5 +232,9 @@
     "typescript": "~5.9.3",
     "webpack": "^5.54.0",
     "webpack-cli": "^6.0.1"
+  },
+  "engines": {
+    "node": ">=20.0.0 <25.0.0",
+    "npm": ">=10.0.0 <12.0.0"
   }
 }