fix windows specific issues with s3 keys not being posix (2)

Author: danielcondemarin

packages/s3-static-assets/src/index.ts

@@ -77,9 +77,8 @@ const uploadStaticAssets = async (
     return files.filter(filterOutDirectories).map(fileItem =>
       s3.uploadFile({
         filePath: fileItem.path,
-        s3Key: path.posix.relative(
-          path.posix.resolve(nextConfigDir),
-          fileItem.path
+        s3Key: pathToPosix(
+          path.relative(path.resolve(nextConfigDir), fileItem.path)
         )
       })
     );