Roll Fuchsia Test Scripts from 0iCv10IlKfiilEBOU... to 6SXRz6wsA2Zm_rAqP... (#191852)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-test-scripts-flutter
Please CC chrome-fuchsia-engprod@google.com,jsimmons@google.com on the
revert to ensure that a human
is aware of the problem.

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https://github.com/flutter/flutter/issues/new/choose

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https://issues.skia.org/issues/new?component=1389291&template=1850622

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