bump lower to v1.9 #2173

Job	Run time
test (InterfaceI, 1.9)	28m 45s
test (InterfaceI, 1)	19m 59s
test (InterfaceII, 1.9)	18m 12s
test (InterfaceII, 1)	24m 47s
test (InterfaceIII, 1.9)	11m 48s
test (InterfaceIII, 1)	16m 49s
test (Integrators_I, 1.9)	14m 42s
test (Integrators_I, 1)	15m 7s
test (AlgConvergence_I, 1.9)	18m 8s
test (AlgConvergence_I, 1)	17m 57s
test (AlgConvergence_II, 1.9)	19m 6s
test (AlgConvergence_II, 1)	29m 38s
test (AlgConvergence_III, 1.9)	21m 19s
test (AlgConvergence_III, 1)	28m 0s
test (Downstream, 1.9)	21m 54s
test (Downstream, 1)	16m 5s
test (ODEInterfaceRegression, 1.9)	21m 15s
test (ODEInterfaceRegression, 1)	14m 47s
test (Multithreading, 1.9)	15m 17s
test (Multithreading, 1)	15m 26s
	6h 29m 1s

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