Roll Fuchsia SDK from 29.20250808.3.1 to 29.20250811.4.1

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: I3904acc9b12af62166bf9d835e453adf3ef2afb7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/444680
Commit-Queue: Alexander Markov <[email protected]>
Reviewed-by: Ben Konyi <[email protected]>
Reviewed-by: Alexander Markov <[email protected]>

Author: DEPS Autoroller

DEPS

@@ -84,7 +84,7 @@ vars = {
   "download_reclient": True,
 
   # Update from https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core
-  "fuchsia_sdk_version": "version:29.20250808.3.1",
+  "fuchsia_sdk_version": "version:29.20250811.4.1",
   "download_fuchsia_deps": False,
 
   # Ninja, runs the build based on files generated by GN.