Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.5.1 to 1.6.1.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](https://github.com/stretchr/testify/compare/v1.5.1...v1.6.1)

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