Bump markdown-link-check from 3.12.2 to 3.13.6 #1377

Job	Run time
run-determination	1s
check-config (./)	15s
check-errors (./)	22s
check-formatting (./)	8s
check-config (docsgen)	24s
check-errors (docsgen)	13s
check-formatting (docsgen)	16s
check-outdated (./)	10s
check-config (ruledocsgen)	13s
check-errors (ruledocsgen)	20s
check-formatting (ruledocsgen)	8s
check-outdated (docsgen)	13s
check-outdated (ruledocsgen)	14s
check-style (./)	12s
check-style (docsgen)	10s
check-style (ruledocsgen)	18s
	3m 37s

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