David Peter 3235cd8019 [red-knot] Fix possible TOCTOU mistake in mdtest runner (#15673) ...

## Summary

Somehow, I managed to crash the `mdtest` runner today. I struggled to
reproduce this again to see if it's actually fixed (even with an
artificial `sleep` between the two `cargo test` invocations), but the
original backtrace clearly showed that this is where the problem
originated from. And it seems like a clear TOCTOU problem.

2025-01-22 15:24:25 +00:00

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