The test 'monitor init abort' fails intermittently

[yurivict]

        Start  99: monitor init abort
 99/101 Test  #99: monitor init abort ............................................***Failed    0.01 sec
Filters: monitor init abort

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
unit_tests is a Catch v2.13.4 host application.
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-------------------------------------------------------------------------------
monitor init abort
-------------------------------------------------------------------------------
/disk-samsung/freebsd-ports/net/cppzmq/work/cppzmq-4.8.1/tests/monitor.cpp:95
...............................................................................

/disk-samsung/freebsd-ports/net/cppzmq/work/cppzmq-4.8.1/tests/monitor.cpp:140: FAILED:
  CHECK( monitor.connect_delayed == 1 )
with expansion:
  0 == 1

===============================================================================
test cases: 1 | 1 failed
assertions: 4 | 3 passed | 1 failed

Version: 4.8.1
OS: FreeBSD 13.1

[gummif]

This will be fixed in #576