[DEPS] Bump golang to 1.21.3

Change-Id: I342a275424ead201a72e7ea4d1a0f203f16f83d9
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/158403
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>

DEPS

diff --git a/DEPS b/DEPS
index 0e9f1c0..9d5c139 100644
--- a/DEPS
+++ b/DEPS
@@ -22,7 +22,7 @@
   # ninja CIPD package version.
   # https://chrome-infra-packages.appspot.com/p/infra/3pp/tools/ninja
   'dawn_ninja_version': 'version:2@1.11.1.chromium.6',
-  'dawn_go_version': 'version:2@1.18.4',
+  'dawn_go_version': 'version:2@1.21.3',
 
   'node_darwin_arm64_sha': '31859fc1fa0994a95f44f09c367d6ff63607cfde',
   'node_darwin_x64_sha': '16dfd094763b71988933a31735f9dea966f9abd6',