Bump github.com/spf13/cobra from 1.8.1 to 1.9.1 in /docsgen #1492

Job	Run time
run-determination	1s
check-config (./)	23s
check-config (docsgen)	18s
check-config (ruledocsgen)	19s
check-errors (./)	20s
check-errors (docsgen)	18s
check-formatting (./)	15s
check-errors (ruledocsgen)	19s
check-formatting (docsgen)	13s
check-formatting (ruledocsgen)	13s
check-outdated (./)	14s
check-outdated (docsgen)	15s
check-style (./)	19s
check-outdated (ruledocsgen)	13s
check-style (docsgen)	16s
check-style (ruledocsgen)	23s
	4m 19s

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