Fix source map loading error for ReactRefreshWebpackPlugin.js.map

Author: unstubbable

packages/next/taskfile.js

@@ -584,7 +584,7 @@ export async function ncc_react_refresh_utils(task, opts) {
   await rmrf(destDir)
   await fs.mkdir(destDir, { recursive: true })
 
-  const files = glob.sync('**/*.{js,json}', { cwd: srcDir })
+  const files = glob.sync('**/*.{js,json,map}', { cwd: srcDir })
 
   for (const file of files) {
     if (file === 'tsconfig.json') continue