delete `buildosx` (#471) #1752

Job	Run time
ubuntu (ubuntu-latest, 3.10, tests/model)	11m 26s
windows (windows-latest, 3.12, tests/model)	18m 16s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_statespace.py)	9m 20s
windows (windows-latest, 3.12, tests/statespace/test_statespace.py)	15m 34s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_kalman_filter.py)	3m 30s
windows (windows-latest, 3.12, tests/statespace/test_kalman_filter.py)	6m 43s
ubuntu (ubuntu-latest, 3.10, tests/statespace --ignore tests/statespace/test_statespace.py --igno...	9m 7s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/test_statespace.py --ig...	13m 28s
ubuntu (ubuntu-latest, 3.10, tests/distributions)	8m 13s
windows (windows-latest, 3.12, tests/distributions)	13m 23s
ubuntu (ubuntu-latest, 3.10, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	15m 30s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	26m 2s
all_tests	1s
	2h 30m 33s

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