Further increase shards for WebGPU CTS on Win/ASAN builds

Most shards still timing out on webgpu_cts_tests,
and few shards still timing out on webgpu_cts_fxc_tests.
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Win10%20x64%20ASAN%20Release%20(Intel)/3605/overview

Change-Id: I7e4ac9fa7f6f724a3546fc362bedaada37443b1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5698016
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1326516}
NOKEYCHECK=True
GitOrigin-RevId: b143ed75d8dc07eb27eeee9cf1313627a3fadb59
2 files changed