Roll Fuchsia Mac SDK from VciXahwZgiusifyh8... to 6PrTSjMiSCsSb0muF... (flutter/engine#45626)

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 rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

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DEPS

@@ -914,7 +914,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': 'VciXahwZgiusifyh8fc6jIjfaKr6VGDrWeIN0Lul1yYC'
+        'version': '6PrTSjMiSCsSb0muF_aumVDnNeyj4kDruWyGDGmjgCYC'
        }
      ],
      'condition': 'host_os == "mac" and not download_fuchsia_sdk',