bump lower to v1.9 #2174

Job	Run time
test (InterfaceI, 1.9)	14m 43s
test (InterfaceI, 1)	22m 35s
test (InterfaceII, 1.9)	25m 34s
test (InterfaceII, 1)	17m 40s
test (InterfaceIII, 1.9)	20m 9s
test (InterfaceIII, 1)	15m 46s
test (Integrators_I, 1.9)	24m 50s
test (Integrators_I, 1)	15m 20s
test (AlgConvergence_I, 1.9)	18m 37s
test (AlgConvergence_I, 1)	17m 57s
test (AlgConvergence_II, 1.9)	25m 29s
test (AlgConvergence_II, 1)	25m 19s
test (AlgConvergence_III, 1.9)	33m 9s
test (AlgConvergence_III, 1)	20m 40s
test (Downstream, 1.9)	16m 25s
test (Downstream, 1)	27m 10s
test (ODEInterfaceRegression, 1.9)	15m 28s
test (ODEInterfaceRegression, 1)	15m 38s
test (Multithreading, 1.9)	17m 38s
test (Multithreading, 1)	11m 26s
	6h 41m 33s

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