Server2 test failure on MacOS

CI failure on `x86_64-darwin` ([ref](https://ci.iog.io/build/1028874/nixlog/1)):
```
Ouroboros.Network
Server2
unidirectional IO: FAIL (100.67s)
*** Failed! Falsified (after 98 tests):
ClientAndServerData {accumulatorInit = -7, hotInitiatorRequests = [[],[-58],[39]], warmInitiatorRequests = [], establishedInitiatorRequests = [[-29,-98],[0,86],[5,77,-4]]}
MuxError (MuxShutdown (Just (MuxIOException Network.Socket.recvBuf: resource vanished (Connection reset by peer)))) "(recv errored)"
Use --quickcheck-replay=44873 to reproduce.
Use -p '/unidirectional IO/' to rerun this test only.
```