Bump github.com/JohannesKaufmann/html-to-markdown from 1.4.0 to 1.6.0 in /ruledocsgen #1383

Job	Run time
run-determination	1s
check-errors (./)	41s
check-errors (docsgen)	32s
check-errors (ruledocsgen)	32s
check-config (./)	11s
check-config (docsgen)	12s
check-formatting (./)	14s
check-formatting (docsgen)	7s
check-outdated (./)	10s
check-config (ruledocsgen)	21s
check-formatting (ruledocsgen)	9s
check-outdated (docsgen)	13s
check-outdated (ruledocsgen)	7s
check-style (./)	24s
check-style (docsgen)	23s
check-style (ruledocsgen)	24s
	4m 41s

Provide feedback