Bump github.com/ulikunitz/xz from 0.5.12 to 0.5.14 in /docsgen #1733

Job	Run time
run-determination	2s
check-outdated (docsgen)	22s
check-errors (ruledocsgen)	51s
check-errors (./)	46s
check-errors (docsgen)	50s
check-style (ruledocsgen)	29s
check-formatting (./)	15s
check-style (./)	23s
check-outdated (./)	14s
check-outdated (ruledocsgen)	22s
check-style (docsgen)	23s
check-config (ruledocsgen)	33s
check-formatting (docsgen)	15s
check-config (./)	28s
check-config (docsgen)	33s
check-formatting (ruledocsgen)	15s
	7m 1s

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