Revert "Roll test262"

This reverts commit effbbb8c.

Reason for revert: Breaks UBSan, see https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20UBSan/12858?

Original change's description:
> Roll test262
> 
> https://chromium.googlesource.com/external/github.com/tc39/test262/+log/e8cdf92..6397602
> 
> Bug: v8:7834, v8:4628, v8:10903, v8:10905
> Change-Id: I65bf15d6308126a4955abe0a6b0647834f4ff066
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2405804
> Reviewed-by: Shu-yu Guo <syg@chromium.org>
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#69899}

TBR=ftang@chromium.org,syg@chromium.org

Change-Id: Ibe552e02cf7e7eb270d32bb6cb0650223259e304
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7834
Bug: v8:4628
Bug: v8:10903
Bug: v8:10905
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2410188Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69900}

DEPS

@@ -206,7 +206,7 @@ deps = {
   'test/mozilla/data':
     Var('chromium_url') + '/v8/deps/third_party/mozilla-tests.git' + '@' + 'f6c578a10ea707b1a8ab0b88943fe5115ce2b9be',
   'test/test262/data':
-    Var('chromium_url') + '/external/github.com/tc39/test262.git' + '@' + '63976020376c8c2b0ebabf37c364f25288d4b93b',
+    Var('chromium_url') + '/external/github.com/tc39/test262.git' + '@' + 'e8cdf923ef0c9ba7fea4399cef309cb2259cf776',
   'test/test262/harness':
     Var('chromium_url') + '/external/github.com/test262-utils/test262-harness-py.git' + '@' + '4555345a943d0c99a9461182705543fb171dda4b',
   'third_party/qemu-linux-x64': {