Bump github.com/go-git/go-git/v5 from 5.12.0 to 5.13.0 in /docsgen #1465

Job	Run time
run-determination	1s
check-errors (./)	44s
check-outdated (./)	13s
check-errors (docsgen)	43s
check-outdated (docsgen)	14s
check-errors (ruledocsgen)	43s
check-outdated (ruledocsgen)	13s
check-config (./)	16s
check-formatting (./)	14s
check-config (docsgen)	27s
check-formatting (docsgen)	13s
check-config (ruledocsgen)	28s
check-formatting (ruledocsgen)	20s
check-style (./)	26s
check-style (docsgen)	26s
check-style (ruledocsgen)	26s
	6m 7s

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