test failure on MacOS

[SingingBush]

src/dunit/assertion.d seems to have a problem on Mac OS with this unit test:

unittest
{
    assertEventually({ static count = 0; return ++count > 23; });

    auto exception = expectThrows!AssertException(assertEventually({ return false; }));

    assertEquals("timed out", exception.msg);
}

Building with either dmd or ldc on macos-latest (github runner) gets the following output:

Run dub test --coverage
    Fetching undead 1.1.8 (getting selected version)
    Starting Performing "unittest-cov" build using /Users/runner/hostedtoolcache/dc/dmd-2.10[6](https://github.com/SingingBush/dunit/actions/runs/7184674452/job/19566285169#step:5:7).0/x64/dmd2/osx/bin/dmd for x[8](https://github.com/SingingBush/dunit/actions/runs/7184674452/job/19566285169#step:5:9)6_64.
    Building undead 1.1.8: building configuration [library]
    Building d-unit ~ci/github_action: building configuration [unittest]
     Linking d-unit
     Running d-unit 
F.

There was 1 failure:
1) dunit.assertion.unittest
src/dunit/assertion.d:688 dunit.assertion.AssertException: timed out

Tests run: 2, Failures: 1, Errors: 0, Skips: 0
NOT OK
Error Program exited with code 2
Error: Process completed with exit code 2.