Bump msquic from `f5bec53` to `6af6550` #503

Job	Run time
Build (ubuntu, x64, openssl, static)	1m 58s
Build (ubuntu, x64, openssl, shared)	1m 47s
Build (windows, x86, schannel, static)	3m 56s
Build (windows, x86, schannel, shared)	3m 39s
Build (windows, x86, openssl, static)	4m 35s
Build (windows, x86, openssl, shared)	4m 36s
Build (windows, x64, schannel, static)	3m 36s
Build (windows, x64, schannel, shared)	3m 12s
Build (windows, x64, openssl, static)	4m 23s
Build (windows, x64, openssl, shared)	4m 18s
	36m 0s

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