directoryMetadata test is flaky on Linux

[swankjesse]

I’ve seen failures like this:

okio.FileHandleFileSystemTest[jvm] > directoryMetadata[jvm] FAILED
    java.lang.AssertionError: expected 2021-10-26T03:00:40.999Z in 2021-10-26T03:00:41Z..2021-10-26T03:00:43Z (relaxed from 2021-10-26T03:00:41.002778Z..2021-10-26T03:00:41.002807Z)
        at org.junit.Assert.fail(Assert.java:89)
        at kotlin.test.junit.JUnitAsserter.fail(JUnitSupport.kt:56)
        at kotlin.test.Asserter$DefaultImpls.assertTrue(Assertions.kt:648)
        at kotlin.test.junit.JUnitAsserter.assertTrue(JUnitSupport.kt:30)
        at kotlin.test.Asserter$DefaultImpls.assertTrue(Assertions.kt:658)
        at kotlin.test.junit.JUnitAsserter.assertTrue(JUnitSupport.kt:30)
        at kotlin.test.AssertionsKt__AssertionsKt.assertTrue(Assertions.kt:44)
        at kotlin.test.AssertionsKt.assertTrue(Unknown Source)
        at okio.AbstractFileSystemTest.assertInRange(AbstractFileSystemTest.kt:2171)
        at okio.AbstractFileSystemTest.directoryMetadata(AbstractFileSystemTest.kt:1015)