test: fix flaky test-memory-usage
abe6a2e3 introduced a test that verifies that ArrayBuffer allocations are tracked. However, V8 supports concurrent freeing of such allocations on background threads, meaning that the results may be subject to race conditions sometimes.
Disabling concurrent freeing makes the test pass consistently.
Refs: https://github.com/nodejs/node/pull/31550
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines