Roll Fuchsia GN SDK from v8vZJSz3FfEj00WMG... to T6ahk2PZvX-n2RabP...

If this roll has caused a breakage, revert this CL and stop the roller
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Cq-Include-Trybots: luci.dart.try:vm-fuchsia-release-x64-try;luci.dart.try:vm-fuchsia-release-arm64-try
Change-Id: I1948a29e81d5f9ea3a596cef5f9ec522f754ac7e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/398849
Reviewed-by: Alexander Aprelev <[email protected]>
Reviewed-by: Ryan Macnak <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>

Author: DEPS Autoroller

DEPS

@@ -631,7 +631,7 @@ deps = {
     "packages": [
       {
       "package": "chromium/fuchsia/gn-sdk",
-      "version": "v8vZJSz3FfEj00WMGMtDrZaN7ATe_tU3i7zgQMrT5_wC",
+      "version": "T6ahk2PZvX-n2RabPqFNTu_AL3tTBGgQMnfAOavwCtsC",
       }
     ],
     "condition": 'download_fuchsia_deps',