Roll Fuchsia Mac SDK from MR_bRfe8I... to pZ9FgVZTK...

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
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DEPS

@@ -516,7 +516,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': 'MR_bRfe8Iqs-oit_vOBInpGrAehp3akKfqVWQjQcSEEC'
+        'version': 'pZ9FgVZTKe6ZwrCLTXs-s6HRYReW0XqmPJy6dnITrPcC'
        }
      ],
      'condition': 'host_os == "mac"',