bump lower to v1.9 #2171

Job	Run time
test (InterfaceI, 1)	14m 51s
test (InterfaceII, 1)	24m 54s
test (InterfaceIII, 1)	16m 15s
test (Integrators_I, 1)	14m 50s
test (AlgConvergence_I, 1)	29m 36s
test (AlgConvergence_II, 1)	19m 29s
test (AlgConvergence_III, 1)	37m 31s
test (Downstream, 1)	28m 3s
test (ODEInterfaceRegression, 1)	14m 55s
test (Multithreading, 1)	11m 12s
	3h 31m 36s

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