Update wasm-spec.

Rolling v8/test/wasm-js/data: https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+log/43898ad..6281d0d

[interpreter] Group digits with '_' when printing numbers (#1006) (Andreas Rossberg)
https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+/6281d0d

TBR=ahaas@chromium.org,clemensh@chromium.org

Change-Id: Ic4c30ff940d0408cab6764b0f097c7926771d888
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1587479Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#61059}

DEPS

@@ -236,7 +236,7 @@ deps = {
     'dep_type': 'cipd',
   },
   'v8/test/wasm-js/data':
-    Var('chromium_url') + '/external/github.com/WebAssembly/spec.git' + '@' + '43898ad2b3203eb5c1cfb28ddb0cb585f74b6b48',
+    Var('chromium_url') + '/external/github.com/WebAssembly/spec.git' + '@' + '6281d0d386845cc7b1aa3a2150b0203307909861',
   'v8/third_party/perfetto':
     Var('android_url') + '/platform/external/perfetto.git' + '@' + '70fed1d420d31510e29aae328cbb3aa3f0a80e25',
   'v8/third_party/protobuf':