Update eslint to use new package

Author: lalalune

eslint.config.mjs

@@ -2,7 +2,7 @@ import eslint from "@eslint/js";
 import tseslint from "@typescript-eslint/eslint-plugin";
 import typescript from "@typescript-eslint/parser";
 import prettier from "eslint-config-prettier";
-import vitest from "eslint-plugin-vitest"; // Add Vitest plugin
+import vitest from "@vitest/eslint-plugin"; // Add Vitest plugin
 
 export default [
     // JavaScript and TypeScript files