Update wasm/futex test's expectation wrt predictability

TBR=aseemgarg@chromium.org

Change-Id: Iabb0a1d5ac065f97baf9b44815f0c5df37b426b5
Reviewed-on: https://chromium-review.googlesource.com/c/1346493Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57689}

test/mjsunit/mjsunit.status

@@ -765,6 +765,7 @@
   # Intentionally non-deterministic using shared arraybuffers.
   'wasm/atomics-stress': [SKIP],
   'wasm/atomics64-stress': [SKIP],
+  'wasm/futex': [SKIP],
 }],  # 'predictable == True'
 
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