Bump github.com/stretchr/testify from 1.6.1 to 1.7.0 (#20)

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.6.1 to 1.7.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.6.1...v1.7.0)

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

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

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/containerssh/geoip v0.9.4
 	github.com/containerssh/log v0.9.9
 	github.com/containerssh/sshserver v0.9.16
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.7.0
 )
 
 replace (