Bump github.com/go-git/go-git/v5 from 5.12.0 to 5.13.0 in /docsgen #1444

Job	Run time
run-determination	1s
check-errors (./)	25s
check-errors (docsgen)	26s
check-outdated (./)	14s
check-style (./)	19s
check-errors (ruledocsgen)	30s
check-outdated (docsgen)	15s
check-style (docsgen)	16s
check-outdated (ruledocsgen)	14s
check-style (ruledocsgen)	16s
check-config (./)	19s
check-config (docsgen)	19s
check-formatting (./)	14s
check-formatting (docsgen)	21s
check-formatting (ruledocsgen)	20s
check-config (ruledocsgen)	19s
	4m 48s

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