Roll Fuchsia SDK from 26.20250106.5.1 to 26.20250120.5.1

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: I9d1d0b5a9d930e0125724fc11cbbaf302b2d9e18
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/405160
Reviewed-by: Zijie He <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>
Reviewed-by: Alexander Aprelev <[email protected]>
Reviewed-by: Alexander Thomas <[email protected]>

Author: DEPS Autoroller

DEPS

@@ -85,7 +85,7 @@ vars = {
   "download_reclient": True,
 
   # Update from https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core
-  "fuchsia_sdk_version": "version:26.20250106.5.1",
+  "fuchsia_sdk_version": "version:26.20250120.5.1",
   "download_fuchsia_deps": False,
 
   # Ninja, runs the build based on files generated by GN.