Roll Fuchsia Mac SDK from AAx6fLy6ykWVhXvNh... to xPacy_rLieLS05d_g... (flutter/engine#41260)

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 jacksongardner@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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https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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DEPS

@@ -836,7 +836,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': 'AAx6fLy6ykWVhXvNh-HIMgu__DL1o0IlzCmHFS9Ljs4C'
+        'version': 'xPacy_rLieLS05d_gX-ieJe6i6Zq9PN_oQzDm0rPNWIC'
        }
      ],
      'condition': 'host_os == "mac" and not download_fuchsia_sdk',