Bump github.com/stretchr/testify from 1.3.0 to 1.6.1

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.3.0 to 1.6.1.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.3.0...v1.6.1)

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

go.mod

@@ -10,6 +10,6 @@ require (
 	github.com/imdario/mergo v0.3.10
 	github.com/json-iterator/go v1.1.10
 	github.com/mitchellh/mapstructure v1.3.3
-	github.com/stretchr/testify v1.3.0
+	github.com/stretchr/testify v1.6.1
 	gopkg.in/yaml.v2 v2.3.0
 )