Bump go.bug.st/relaxed-semver from 0.11.0 to 0.15.0 #1549

Job	Run time
run-determination	1s
check-errors (./)	46s
check-errors (docsgen)	17s
check-errors (ruledocsgen)	17s
check-formatting (./)	18s
check-formatting (docsgen)	18s
check-formatting (ruledocsgen)	16s
check-outdated (./)	20s
check-outdated (docsgen)	15s
check-outdated (ruledocsgen)	15s
check-style (./)	23s
check-style (docsgen)	33s
check-style (ruledocsgen)	27s
check-config (./)	22s
check-config (docsgen)	18s
check-config (ruledocsgen)	18s
	5m 24s

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