Bump github.com/go-git/go-git/v5 from 5.12.0 to 5.13.0 in /docsgen #1442

Job	Run time
run-determination	1s
check-errors (./)	22s
check-formatting (./)	14s
check-errors (docsgen)	27s
check-outdated (./)	15s
check-formatting (docsgen)	21s
check-errors (ruledocsgen)	25s
check-outdated (docsgen)	21s
check-formatting (ruledocsgen)	21s
check-outdated (ruledocsgen)	13s
check-style (./)	17s
check-style (docsgen)	24s
check-config (./)	18s
check-style (ruledocsgen)	17s
check-config (docsgen)	23s
check-config (ruledocsgen)	18s
	4m 57s

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