Update Node.js version support to 24.x

Bump Node.js version requirement from 20.x to 24.x in action configuration and package files. Update @types/node and undici-types dependencies to match Node 24 compatibility.

package.json

@@ -1,15 +1,14 @@
 {
   "name": "@actions/github-script",
   "description": "A GitHub action for executing a simple script",
+  "engines": {
+    "node": ">=24"
+  },
   "version": "7.0.1",
   "author": "GitHub",
   "license": "MIT",
   "main": "dist/index.js",
   "types": "types/async-function.d.ts",
-  "private": true,
-  "engines": {
-    "node": ">=20.0.0 <21.0.0"
-  },
   "scripts": {
     "build": "npm run build:types && ncc build src/main.ts",
     "build:types": "tsc src/async-function.ts -t es5 --declaration --allowJs --emitDeclarationOnly --outDir types",
@@ -47,7 +46,7 @@
     "@octokit/core": "^5.0.1",
     "@octokit/plugin-request-log": "^4.0.0",
     "@octokit/plugin-retry": "^6.0.1",
-    "@types/node": "^20.9.0"
+    "@types/node": "^24.1.0"
   },
   "devDependencies": {
     "@types/jest": "^29.5.5",