Tidy dependent modules to reflect `github.com/stretchr/testify` bump #1378

Job	Run time
run-determination	1s
check-errors (./)	37s
check-errors (docsgen)	35s
check-errors (ruledocsgen)	38s
check-outdated (./)	8s
check-outdated (docsgen)	7s
check-style (./)	15s
check-outdated (ruledocsgen)	10s
check-style (docsgen)	20s
check-config (./)	17s
check-style (ruledocsgen)	15s
check-config (docsgen)	18s
check-formatting (./)	15s
check-config (ruledocsgen)	13s
check-formatting (docsgen)	14s
check-formatting (ruledocsgen)	13s
	4m 36s

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