Roll fuchsia/clang/mac-amd64 from 6tttO... to OzTZO... (#13690)

Roll fuchsia/clang/mac-amd64 from 6tttO... to OzTZO...

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-toolchain-flutter-engine
Please CC  on the revert to ensure that a human
is aware of the problem.

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:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

DEPS

@@ -552,7 +552,7 @@ deps = {
      'packages': [
        {
         'package': 'fuchsia/clang/mac-amd64',
-        'version': '6tttOTlynvfnjkMSTokwfI4sj7gfuyeF02Y6F7zwBKkC'
+        'version': 'OzTZOKkICT0yD82Dbx0jvVn5hN5eOSi6ByVTDseE7i0C'
        }
      ],
      'condition': 'host_os == "mac"',