Bump msquic from `c4a5a38` to `5a9b9a7` (#184) #401

Job	Run time
Build (ubuntu, x64, openssl, static)	1m 56s
Build (ubuntu, x64, openssl, shared)	1m 49s
Build (windows, x86, schannel, static)	4m 8s
Build (windows, x86, schannel, shared)	3m 38s
Build (windows, x86, openssl, static)	4m 48s
Build (windows, x86, openssl, shared)	4m 37s
Build (windows, x64, schannel, static)	4m 12s
Build (windows, x64, schannel, shared)	3m 19s
Build (windows, x64, openssl, static)	4m 26s
Build (windows, x64, openssl, shared)	5m 7s
	38m 0s

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