Roll Fuchsia Mac SDK from 8nJB1-rSpC5L4digu... to xRUHI4zSil6TevQTa... (flutter/engine#45160)

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

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DEPS

@@ -886,7 +886,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': '8nJB1-rSpC5L4diguRxuRnrPvyA2teDU5ZsF4vcKNfwC'
+        'version': 'xRUHI4zSil6TevQTayC6ixO1AF6BHpBc4ONyy5G6kLIC'
        }
      ],
      'condition': 'host_os == "mac" and not download_fuchsia_sdk',