Skip concurrent allocation test

Test has flaky data race and will be fixed after branch to avoid
regressions.

Bug: v8:10637, v8:10315
Change-Id: Iddbbd91701aea622803146b84c9a9aa334bda927
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2263155Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68506}

test/cctest/cctest.status

@@ -97,6 +97,9 @@
   # BUG(3742).
   'test-mark-compact/MarkCompactCollector': [PASS, ['arch==arm', NO_VARIANTS]],
 
+  # BUG(10637).
+  'test-concurrent-allocation/ConcurrentAllocationInOldSpace': [SKIP],
+
   # Test that serialization with unknown external reference fails.
   'test-serialize/SnapshotCreatorUnknownExternalReferences': [FAIL],
   'test-serialize/SnapshotCreatorUnknownHandles': [FAIL],