[test] Disable flaky cctest on stress_concurrent_allocation

Bug: v8:11695
Change-Id: I3b558260a23b4fb7d16bc8f1e9c57b94bce03838
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2854299Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74228}

test/cctest/cctest.status

@@ -725,6 +725,13 @@
   'test-heap/ObjectsInEagerlyDeoptimizedCodeAreWeak': [PASS, FAIL],
 }], # variant == stress_concurrent_inlining
 
+################################################################################
+['variant == stress_concurrent_allocation', {
+  # BUG(11695): Crashing flakily.
+  'test-serialize/StartupSerializerTwiceRunScript': [PASS, FAIL],
+}], # variant == stress_concurrent_allocation
+
+
 ################################################################################
 ['third_party_heap', {
   # v8::Unwinder::PCIsInV8 is not supported