Roll Fuchsia Mac SDK from pZ9FgVZTK... to WLxBkBnZa... (#22055)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-mac-sdk-flutter-engine
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

DEPS

@@ -516,7 +516,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': 'pZ9FgVZTKe6ZwrCLTXs-s6HRYReW0XqmPJy6dnITrPcC'
+        'version': 'WLxBkBnZaNoU9jUg-hJISRzU7ypNG7hHa5RaOKH3dx4C'
        }
      ],
      'condition': 'host_os == "mac"',