mod: bump github.com/ulikunitz/xz from 0.5.12 to 0.5.14 in the go_modules group #17819

Job	Run time
aux	4m 35s
build	3m 45s
old	4m 1s
dashboard	2m 9s
gvisor	3m 47s
race	9m 11s
race_dashboard	3m 45s
arch (presubmit_arch_openbsd)	3m 45s
arch (presubmit_arch_executor)	3m 16s
arch (presubmit_arch_netbsd)	3m 44s
arch (presubmit_arch_darwin)	3m 36s
arch (presubmit_arch_windows)	3m 39s
arch (presubmit_arch_linux)	4m 23s
arch (presubmit_arch_freebsd)	4m 27s
	58m 3s

Provide feedback