Guarantee `zmq-core` has been loaded #87

Job	Run time
test (ubuntu-latest, 26.3)	2m 26s
test (ubuntu-latest, 27.2)	3m 28s
test (ubuntu-latest, 28.2)	3m 38s
test (ubuntu-latest, snapshot)	2m 33s
test (macos-latest, 26.3)	48s
test (macos-latest, 27.2)	55s
test (macos-latest, 28.2)	1m 6s
test (macos-latest, snapshot)	1m 0s
test (windows-latest, 26.3)	6m 37s
test (windows-latest, 27.2)	5m 18s
test (windows-latest, 28.2)	5m 12s
test (windows-latest, snapshot)	3m 59s
	37m 0s

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