Roll Fuchsia GN SDK from RgErspyYHapUO2Spc... to sbh76PYVTMxav4ACT...

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-gn-sdk-dart-sdk
Please CC chrome-fuchsia-engprod@google.com,dart-vm-gardener@grotations.appspotmail.com on the revert to ensure that a human
is aware of the problem.

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Change-Id: I5f32bc582995f1c20d3adc2a0e8beda2cc0ba29f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/374163
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

DEPS

@@ -712,7 +712,7 @@ Var("dart_root") + "/third_party/pkg/tar":
     "packages": [
       {
       "package": "chromium/fuchsia/gn-sdk",
-      "version": "RgErspyYHapUO2SpcW-vo2p8yaRUMUrq0eWjRVPfQjoC",
+      "version": "sbh76PYVTMxav4ACTgA-TXWcbZTZcWWjsqATCxrGIvwC",
       }
     ],
     "condition": 'download_fuchsia_deps',