change var to variable (#512) #1842

Job	Run time
ubuntu (ubuntu-latest, 3.11, tests/distributions)	6m 21s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	8m 13s
windows (windows-latest, 3.12, tests/model)	14m 9s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	14m 6s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	23m 20s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	7m 31s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	5m 11s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	12m 18s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	2m 31s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	11m 50s
windows (windows-latest, 3.12, tests/distributions)	11m 13s
ubuntu (ubuntu-latest, 3.11, tests/model)	9m 12s
all_tests	3s
	2h 5m 58s

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