Make it a ext #4

Job	Run time
downgrade (1.10, core)	16m 34s
test (core, 1.10, ubuntu-latest)	16m 29s
downgrade (1.10, downstream)	9m 10s
test (core, 1.10, macos-latest)	12m 43s
downgrade (1.10, wrappers)	11m 3s
test (core, 1.10, windows-latest)	20m 30s
test (core, 1, ubuntu-latest)	28m 54s
test (core, 1, macos-latest)	19m 14s
test (core, 1, windows-latest)	33m 5s
test (downstream, 1.10, ubuntu-latest)	8m 27s
test (downstream, 1.10, macos-latest)	6m 2s
test (downstream, 1.10, windows-latest)	11m 22s
test (downstream, 1, ubuntu-latest)	17m 52s
test (downstream, 1, macos-latest)	10m 55s
test (downstream, 1, windows-latest)	22m 9s
test (wrappers, 1.10, ubuntu-latest)	10m 7s
test (wrappers, 1.10, macos-latest)	6m 11s
test (wrappers, 1.10, windows-latest)	13m 37s
test (wrappers, 1, ubuntu-latest)	20m 18s
test (wrappers, 1, macos-latest)	11m 33s
test (wrappers, 1, windows-latest)	23m 53s
	5h 30m 8s

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