Revert "[wasm] Update spec tests"

This reverts commit ee2b5a56.

Reason for revert: wasm-spec-tests\tests\conversions.js fails on win32-debug: https://ci.chromium.org/p/v8/builders/ci/V8%20Win32%20-%20debug/21210

Original change's description:
> [wasm] Update spec tests
> 
> R=​clemensh@chromium.org
> 
> Change-Id: Ia4c70327861d5025f4a09513a02bc6176e7b8f18
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1702606
> Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> Commit-Queue: Andreas Haas <ahaas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62733}

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

Change-Id: I16382ab16681660ef2042027ce0cb87d5b4af3ee
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1702614Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62736}

test/wasm-spec-tests/tests.tar.gz.sha1

-98e92e6d0aed421fc9d54895dbafb8aa9a878820
\ No newline at end of file
+e8bdb558198b944ff8a0df43301f1ff4eb3a91fa
\ No newline at end of file