Update wasm-spec.

Rolling v8/test/wasm-js/data: https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+log/f20b8e9..c46d4fa

[spec] Work around Sphinx/Latex issue (#1004) (Andreas Rossberg)
https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+/c46d4fa

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

Change-Id: Id928f05d1ccec2f24d8bbe6eaca6bc646c58f6fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1576818Reviewed-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@{#60935}

DEPS

@@ -236,7 +236,7 @@ deps = {
     'dep_type': 'cipd',
   },
   'v8/test/wasm-js/data':
-    Var('chromium_url') + '/external/github.com/WebAssembly/spec.git' + '@' + 'f20b8e97e0adf70a399c99043eab1e2b98be9bd1',
+    Var('chromium_url') + '/external/github.com/WebAssembly/spec.git' + '@' + 'c46d4fa0105cab3220437ae65aaec6380d7ee6c0',
   'v8/third_party/perfetto':
     Var('android_url') + '/platform/external/perfetto.git' + '@' + '21a33afeef568f72668acf77668a32307a363d6e',
   'v8/third_party/protobuf':