Roll Fuchsia Mac SDK from 6nMZjuYXTcnD_VZQI... to FxFPRn_9rSWWAWFw0...

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

@@ -829,7 +829,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': '6nMZjuYXTcnD_VZQIIhejhcL-FKJ5hAlphbOZ97Hv70C'
+        'version': 'FxFPRn_9rSWWAWFw00AOWfeGgtuIFuSf_fjDPVDtXOQC'
        }
      ],
      'condition': 'host_os == "mac" and not download_fuchsia_sdk',