Update wasm-spec.

Rolling v8/test/wasm-js/data: https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+log/d51ec1b..4406612

[test] Check for "unreachable" consistently (#992) (Ben Smith)
https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+/4406612

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

Change-Id: Ib25b56bc297e47a8a35ba868707d9c689f71d79c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1541451Reviewed-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@{#60498}

DEPS

@@ -235,7 +235,7 @@ deps = {
     'dep_type': 'cipd',
   },
   'v8/test/wasm-js/data':
-    Var('chromium_url') + '/external/github.com/WebAssembly/spec.git' + '@' + 'd51ec1bdb865d2c4c9cabebef64dd02da9883f53',
+    Var('chromium_url') + '/external/github.com/WebAssembly/spec.git' + '@' + '4406612ae0f6c3c4e7791eb13704e9fb7440819a',
 }
 
 recursedeps = [