update-go-pkg(deps): bump github.com/stretchr/testify (#1918)

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.8.1 to 1.8.4.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.8.1...v1.8.4)

---
updated-dependencies:
- dependency-name: github.com/stretchr/testify
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -28,7 +28,7 @@ require (
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/sirupsen/logrus v1.7.0
 	github.com/spf13/afero v1.8.2
-	github.com/stretchr/testify v1.8.1
+	github.com/stretchr/testify v1.8.4
 	github.com/technosophos/moniker v0.0.0-20180509230615-a5dbd03a2245
 	github.com/unrolled/secure v0.0.0-20181221173256-0d6b5bb13069
 	go.etcd.io/etcd/api/v3 v3.5.9

go.sum

@@ -492,8 +492,9 @@ github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 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 v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+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/technosophos/moniker v0.0.0-20180509230615-a5dbd03a2245 h1:DNVk+NIkGS0RbLkjQOLCJb/759yfCysThkMbl7EXxyY=
 github.com/technosophos/moniker v0.0.0-20180509230615-a5dbd03a2245/go.mod h1:O1c8HleITsZqzNZDjSNzirUGsMT0oGu9LhHKoJrqO+A=
 github.com/tidwall/pretty v1.0.0 h1:HsD+QiTn7sK6flMKIvNmpqz1qrpP3Ps6jOKIKMooyg4=