Bump github.com/stretchr/testify from 1.8.4 to 1.9.0 #1185

Job	Run time
run-determination	1s
check-errors (./)	38s
check-config (./)	22s
check-errors (docsgen)	33s
check-formatting (./)	18s
check-config (docsgen)	20s
check-errors (ruledocsgen)	38s
check-outdated (./)	16s
check-formatting (docsgen)	15s
check-config (ruledocsgen)	20s
check-outdated (docsgen)	15s
check-formatting (ruledocsgen)	14s
check-outdated (ruledocsgen)	16s
check-style (./)	22s
check-style (docsgen)	20s
check-style (ruledocsgen)	18s
	5m 26s

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