Use `gem unpack` to get precompiled extensions on Windows #32

Job	Run time
cross-compile-linux	13s
install-macos-m1 (2.7)	54s
install-windows-native (2.7)	3m 24s
cross-compile-windows (x64-mingw32)	1m 1s
install-macos-m1 (3.0)	25s
install-windows-native (3.0)	2m 2s
install-macos-m1 (3.1)	26s
cross-compile-windows (x86-mingw32)	49s
install-macos-m1 (3.2)	25s
install-windows-native (3.1)	2m 15s
cross-compile-windows (x64-mingw-ucrt)	58s
install-macos-m1 (3.3)	23s
install-windows-native (3.2)	2m 4s
install-windows-native (3.3)	4m 17s
test-linux (2017, 2.7)	1m 27s
test-linux (2017, 3.0)	1m 16s
test-linux (2017, 3.1)	1m 12s
test-linux (2017, 3.2)	1m 7s
test-linux (2017, 3.3)	1m 15s
test-linux (2019, 2.7)	1m 23s
test-linux (2019, 3.0)	1m 20s
test-linux (2019, 3.1)	1m 24s
test-linux (2019, 3.2)	1m 17s
test-linux (2019, 3.3)	1m 29s
test-linux (2022, 2.7)	1m 23s
test-linux (2022, 3.0)	1m 27s
test-linux (2022, 3.1)	1m 17s
test-linux (2022, 3.2)	1m 13s
test-linux (2022, 3.3)	1m 18s
install-windows-mingw (2.7)	2m 51s
test-windows-mingw (2019, 2.7)	3m 51s
install-windows-mingw (3.0)	1m 49s
test-windows-ucrt (2019, 3.1)	2m 12s
test-windows-mingw (2019, 3.0)	2m 14s
install-windows-ucrt (3.1)	1m 13s
test-windows-ucrt (2019, 3.2)	2m 12s
test-windows-mingw (2022, 2.7)	3m 47s
test-windows-ucrt (2019, 3.3)	2m 54s
install-windows-ucrt (3.2)	1m 26s
test-windows-mingw (2022, 3.0)	3m 2s
install-windows-ucrt (3.3)	2m 58s
test-windows-ucrt (2022, 3.1)	2m 12s
test-windows-ucrt (2022, 3.2)	2m 16s
test-windows-ucrt (2022, 3.3)	6m 26s
	1h 20m 47s

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