Bump gopkg.in/yaml.v2 from 2.3.0 to 2.4.0 in /kotsadm/operator

Bumps [gopkg.in/yaml.v2](https://github.com/go-yaml/yaml) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/go-yaml/yaml/releases)
- [Commits](go-yaml/yaml@v2.3.0...v2.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

kotsadm/operator/go.mod

@@ -14,7 +14,7 @@ require (
 	github.com/replicatedhq/troubleshoot v0.10.12
 	github.com/spf13/cobra v0.0.7
 	github.com/spf13/viper v1.4.0
-	gopkg.in/yaml.v2 v2.3.0
+	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.18.4
 	k8s.io/apimachinery v0.18.4
 	k8s.io/client-go v0.18.4