Bump github.com/JohannesKaufmann/html-to-markdown from 1.4.0 to 1.6.0 in /ruledocsgen #1382

Job	Run time
run-determination	1s
check-errors (./)	30s
check-outdated (./)	8s
check-errors (docsgen)	44s
check-outdated (docsgen)	7s
check-outdated (ruledocsgen)	8s
check-errors (ruledocsgen)	56s
check-style (./)	24s
check-config (./)	11s
check-style (docsgen)	21s
check-formatting (./)	8s
check-style (ruledocsgen)	16s
check-config (docsgen)	10s
check-formatting (docsgen)	10s
check-config (ruledocsgen)	12s
check-formatting (ruledocsgen)	12s
	4m 38s

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