Fix adapter-vercel imports

Author: benmccann

.changeset/new-birds-march.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-vercel': patch
+---
+
+Fix adapter-vercel imports

packages/adapter-vercel/index.js

@@ -1,6 +1,6 @@
-import { writeFileSync, mkdirSync, renameSync } from 'fs';
-import { resolve, join } from 'path';
-import { copy } from '@sveltejs/app-utils/files';
+const { writeFileSync, mkdirSync, renameSync } = require('fs');
+const { resolve, join } = require('path');
+const { copy } = require('@sveltejs/app-utils/files');
 
 module.exports = function () {
 	/** @type {import('@sveltejs/kit').Adapter} */