Timeout error in mux test on Windows

```
prop_timeouts_io withTimeoutSerialNative: FAIL (1405.83s)
*** Failed! Falsified (after 61 tests and 30 shrinks):
[(0s,0.002s),(0s,0s),(0s,0.003s),(0s,0s),(0s,0s),(0.005s,0.005s),(0s,0.001s),(0.004s,0.003s),(0.004s,0s),(0s,0s),(0.003s,0.001s),(0.005s,0s),(0s,0.008s),(0s,0.003s),(0.005s,0.009s),(0s,0.003s),(0.006s,0.005s),(0.001s,0.002s),(0.004s,0.007s),(0s,0.005s),(0s,0.001s),(0.009s,0.004s),(0.0021321961s,0.002s),(0.001s,0s),(0.005s,0.004s),(0.00201409869s,0s),(0.004s,0.007s),(0.005s,0.001s)]
failure on timeout test #27
intendedTimeoutDuration: 0.004s
intendedActionDuration: 0.007s
intendedOverallDuration: 0.004s
actualOverallDuration: 0.5001755s
positiveSchedulingTolerance: 0.1s
violation of timer sanity property:
actualOverallDuration <= intendedOverallDuration
+ positiveSchedulingTolerance
Use --quickcheck-replay=21133 to reproduce.
```

extracted [from](https://github.com/input-output-hk/ouroboros-network/runs/602028322?check_suite_focus=true)