Bump actions/checkout from 3.5.3 to 3.6.0 (#150) #346

Job	Run time
Build (ubuntu, x64, openssl, static)	2m 39s
Build (ubuntu, x64, openssl, shared)	2m 22s
Build (windows, x86, schannel, static)	4m 41s
Build (windows, x86, schannel, shared)	4m 55s
Build (windows, x86, openssl, static)	6m 28s
Build (windows, x86, openssl, shared)	8m 26s
Build (windows, x64, schannel, static)	5m 36s
Build (windows, x64, schannel, shared)	4m 30s
Build (windows, x64, openssl, static)	8m 21s
Build (windows, x64, openssl, shared)	5m 48s
	53m 46s

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