fix: move midline-flush.c sleep to occur between flush() invocations #12
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We were doing the sleep() invocation between writing to the stdout/err file descriptors rather than between the times we were flushing them. This update divides the time slept by 3 (bringing it to approx 3x what it was before we encountered CI failures), while moving the sleep between the two flush() invocations.
It also adds an extra sleep following the second flush() invocation to make sure that the kernel has time to communicate its contents before the subsequent test.