tools/syz-reproducers.sh: use new archive structure #14409

Job	Run time
aux	4m 54s
arch (presubmit_arch_linux)	10m 33s
dashboard	3m 38s
build	11m 4s
arch (presubmit_arch_freebsd)	6m 25s
gvisor	4m 11s
arch (presubmit_arch_netbsd)	4m 24s
old	6m 41s
arch (presubmit_arch_openbsd)	4m 23s
race	6m 15s
arch (presubmit_arch_darwin)	4m 22s
race_dashboard	3m 47s
arch (presubmit_arch_windows)	3m 24s
arch (presubmit_arch_executor)	3m 14s
	1h 17m 15s

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