mod: bump github.com/ulikunitz/xz in the go_modules group #17818

Job	Run time
aux	4m 33s
race	9m 13s
build	3m 16s
arch (presubmit_arch_executor)	3m 14s
arch (presubmit_arch_windows)	3m 29s
arch (presubmit_arch_openbsd)	3m 42s
arch (presubmit_arch_freebsd)	4m 27s
gvisor	3m 50s
race_dashboard	2m 47s
arch (presubmit_arch_netbsd)	3m 57s
arch (presubmit_arch_darwin)	3m 39s
old	4m 2s
dashboard	2m 29s
arch (presubmit_arch_linux)	4m 26s
	57m 4s

Provide feedback