Roll Fuchsia Mac SDK from 68DESTl_q6I45UJyb... to QKekosWnIY_ObKstn... (flutter/engine#45217)

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

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

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:
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DEPS

@@ -886,7 +886,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': '68DESTl_q6I45UJybf_gTTh2BU9FCq4XHR0QuJo5RJEC'
+        'version': 'QKekosWnIY_ObKstnfItjOWSgi14RL_O43p2q4KSarUC'
        }
      ],
      'condition': 'host_os == "mac" and not download_fuchsia_sdk',