Fix downgrade CI #471

Job	Run time
downgrade (1.10, alloc_check)	3m 45s
downgrade (1.10, core)	11m 6s
downgrade (1.10, adjoint)	6m 23s
test (1.10, macos-latest, core)	12m 15s
test (1.10, ubuntu-latest, alloc_check)	3m 36s
test (1.10, macos-latest, adjoint)	5m 24s
test (1.10, ubuntu-latest, adjoint)	6m 13s
test (1, ubuntu-latest, adjoint)	13m 22s
test (1.10, ubuntu-latest, core)	10m 42s
test (1, ubuntu-latest, alloc_check)	9m 53s
test (1, ubuntu-latest, core)	20m 26s
test (1.10, macos-latest, alloc_check)	2m 22s
test (1, macos-latest, core)	15m 17s
test (1, macos-latest, adjoint)	8m 36s
test (1, macos-latest, alloc_check)	5m 50s
	2h 15m 10s

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