Add cache for windows CI #150

Job	Run time
macos	4m 0s
aarch64-unknown-linux-gnu ()	6m 55s
macos (static)	4m 23s
armv7-unknown-linux-gnueabihf ()	6m 22s
macos (system)	28s
aarch64-unknown-linux-gnu (static)	6m 48s
armv7-unknown-linux-gnueabihf (static)	6m 33s
windows-msvc (x64-windows)	12m 31s
aarch64-unknown-linux-gnu (system)	1m 7s
windows-msvc (x64-windows-static)	19m 45s
armv7-unknown-linux-gnueabihf (system)	1m 10s
windows-msvc (x64-windows-static-md)	19m 44s
x86_64-unknown-linux-gnu	6m 43s
x86_64-unknown-linux-gnu (static)	6m 42s
x86_64-unknown-linux-gnu (system)	39s
	1h 43m 50s

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