`AwaitSignalTest.signaled` is flaky

[JakeWharton]

okio.AwaitSignalTest[jvm] > signaled[BASE][jvm] FAILED
    java.lang.AssertionError: expected:<1000.0> but was:<1381.7652080000844>
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.failNotEquals(Assert.java:835)
        at org.junit.Assert.assertEquals(Assert.java:555)
        at org.junit.Assert.assertEquals(Assert.java:685)
        at okio.AwaitSignalTest.assertElapsed(AwaitSignalTest.kt:208)
        at okio.AwaitSignalTest.signaled(AwaitSignalTest.kt:57)