Bump github.com/spf13/pflag from 1.0.7 to 1.0.9 #1750

Job	Run time
run-determination	4s
check-outdated (./)	25s
check-outdated (ruledocsgen)	20s
check-style (ruledocsgen)	34s
check-style (docsgen)	32s
check-outdated (docsgen)	24s
check-formatting (docsgen)	23s
check-style (./)	28s
check-errors (./)	54s
check-formatting (ruledocsgen)	18s
check-formatting (./)	22s
check-errors (docsgen)	29s
check-config (ruledocsgen)	22s
check-errors (ruledocsgen)	20s
check-config (./)	23s
check-config (docsgen)	24s
	6m 42s

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