test: fix flaky test-domain-timers #21019
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It's possible for this test to be (extremely infrequently) flaky if 1ms (which due to rounding in libuv could be far less, actually) or more elapses between setting the two timeouts. In that case, the second timer will not fire and the test will fail.
This failed recently in https://ci.nodejs.org/job/node-test-commit-linuxone/1701/nodes=rhel72-s390x/testReport/junit/(root)/test/parallel_test_domain_timers/
Checklist
make -j4 test
(UNIX), orvcbuild test
(Windows) passes