feat: update templates for eslint v9

1. use flat config
2. add .npmrc (package-lock=false), just same as eslint repo
3. update required node.js & eslint

.npmrc

@@ -0,0 +1 @@
+package-lock = false

README.md

@@ -8,7 +8,7 @@ First and foremost, you must have [Node.js](https://nodejs.org/) and npm install
 
 > **Requirements**
 >
-> - Node.js ^14.17.0 || ^16.0.0 || >= 18.0.0
+> - Node.js ^18.18.0 || ^20.9.0 || >=21.1.0
 
 You must also install Yeoman, if you don't have it installed already. To install Yeoman, you can run this command:
 

eslint.config.js

@@ -0,0 +1,8 @@
+"use strict";
+import eslintConfigESLint from "eslint-config-eslint";
+
+export default [
+    ...eslintConfigESLint,
+    {files: ["tests/**/*.js"],
+    languageOptions: { globals: globals.mocha }}
+];