mod: bump github.com/stretchr/testify from 1.8.4 to 1.9.0 (#7714)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -37,7 +37,7 @@ require (
 	github.com/satori/go.uuid v1.2.0
 	github.com/sergi/go-diff v1.3.1
 	github.com/sourcegraph/run v0.12.0
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.9.0
 	github.com/unknwon/cae v1.0.2
 	github.com/unknwon/com v1.0.1
 	github.com/unknwon/i18n v0.0.0-20190805065654-5c6446a380b6

go.sum

@@ -338,8 +338,9 @@ github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81P
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
 github.com/unknwon/cae v1.0.2 h1:3L8/RCN1ARvD5quyNjU30EdvYkFbxBfnRcIBXugpHlg=
 github.com/unknwon/cae v1.0.2/go.mod h1:HqpmD2fVq9G1oGEXrXzbgIp51uJ29Hshv41n9ljm+AA=