build(deps): bump github.com/stretchr/testify from 1.6.1 to 1.8.4

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.6.1 to 1.8.4.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.6.1...v1.8.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -15,9 +15,10 @@ require (
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/openshift/api v3.9.0+incompatible
 	github.com/pkg/errors v0.9.1
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.8.4
 	go.uber.org/zap v1.15.0
 	golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0
+	golang.org/x/mod v0.4.2
 	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
 	k8s.io/api v0.20.2
@@ -26,6 +27,5 @@ require (
 	k8s.io/client-go v0.20.2
 	k8s.io/utils v0.0.0-20201110183641-67b214c5f920
 	sigs.k8s.io/controller-runtime v0.7.0
-	golang.org/x/mod  v0.4.2
 
 )