Make it a ext #4

Job	Run time
downgrade (1.10, core)	13m 49s
test (1.10, ubuntu-latest, core)	13m 15s
downgrade (1.10, adjoint)	8m 31s
test (1.10, ubuntu-latest, adjoint)	8m 35s
downgrade (1.10, alloc_check)	8m 28s
test (1.10, ubuntu-latest, alloc_check)	8m 45s
test (1.10, macos-latest, core)	13m 23s
test (1.10, macos-latest, adjoint)	6m 0s
test (1.10, macos-latest, alloc_check)	5m 32s
test (1.10, windows-latest, core)	14m 39s
test (1.10, windows-latest, adjoint)	9m 42s
test (1.10, windows-latest, alloc_check)	9m 52s
test (1, ubuntu-latest, core)	23m 3s
test (1, ubuntu-latest, adjoint)	15m 52s
test (1, ubuntu-latest, alloc_check)	14m 44s
test (1, macos-latest, core)	16m 27s
test (1, macos-latest, adjoint)	9m 43s
test (1, macos-latest, alloc_check)	8m 46s
test (1, windows-latest, core)	23m 41s
test (1, windows-latest, adjoint)	17m 12s
test (1, windows-latest, alloc_check)	16m 53s
	4h 26m 52s

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