feat(gmp): 加 CN 镜像 #690

Job	Run time
select	10s
mirror-cn-reachable	7m 37s
lint	9s
graphics install: no side effects on unrelated members	1m 40s
workspace (linux llvm 0/1)	1m 2s
workspace (windows default 0/1)	1m 59s
workspace (linux default 0/1)	40s
workspace (macos default 0/1)	1m 5s
timings	6s
	14m 28s

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