[webgpu] Bump version of Dawn to 9733be39e

[fs-eire]

Description

Upgrade the version of Dawn from 991810463a to 9733be39e.

This change removes 2 patches:

• dawn_allow_non_uniform_for_subgroup_matrix_args.patch
  Change [WebGPU-EP] Disable SubgroupMatrix uniformity checks #25028 is the preferred way so that we no longer need this patch.

• dawn_fix_build_gcc12.patch
  The fix is merged in upstream: https://dawn-review.googlesource.com/c/dawn/+/212074

Motivation and Context

[Copilot]

Pull Request Overview

Bumps the Dawn dependency to a newer commit and removes two now-unnecessary patches, while updating shader handling for subgroup matrix uniformity.

• Upgrade Dawn from commit 991810463a to 9733be39e
• Drop the dawn_allow_non_uniform_for_subgroup_matrix_args and dawn_fix_build_gcc12 patches
• Add a diagnostic override in the WebGPU shader helper for subgroup matrix uniformity

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

File	Description
onnxruntime/core/providers/webgpu/shader_helper.cc	Insert disable diagnostic and related comments for subgroup matrix
cmake/patches/dawn/dawn_fix_build_gcc12.patch	Remove obsolete GCC12 build-fix patch
cmake/external/onnxruntime_external_deps.cmake	Remove patch applications for subgroup matrix & GCC12
cmake/deps.txt	Update Dawn archive URL and checksum

Comments suppressed due to low confidence (2)

onnxruntime/core/providers/webgpu/shader_helper.cc:383

• [nitpick] The phrase "in change https://..." is unclear; consider rephrasing to "in the change https://..." or similar for better readability.

// Dawn enforces the subgroup matrix builtin arguments to be uniform in change https://dawn-review.googlesource.com/c/dawn/+/236054

onnxruntime/core/providers/webgpu/shader_helper.cc:383

• [nitpick] The inserted comment is indented with 4 spaces, but surrounding ss << lines use 6 spaces. Align the comment indentation to match for consistency.

// Dawn enforces the subgroup matrix builtin arguments to be uniform in change https://dawn-review.googlesource.com/c/dawn/+/236054