fix(nextjs): src package.json should not be copied to output folder

closes: #21535

packages/next/src/executors/build/lib/create-next-config-file.ts

@@ -77,12 +77,15 @@ export function createNextConfigFile(
   );
   for (const moduleFile of moduleFilesToCopy) {
     ensureDirSync(dirname(join(context.root, options.outputPath, moduleFile)));
+    // We already generate a build version of package.json in the dist folder.
+    if (moduleFile !== 'package.json') {
       copyFileSync(
         join(context.root, projectRoot, moduleFile),
         join(context.root, options.outputPath, moduleFile)
       );
     }
   }
+}
 
 function readSource(getFile: () => string): { file: string; content: string } {
   return {