Bump github.com/stretchr/testify from 1.2.2 to 1.6.1 (#2)

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.2.2 to 1.6.1.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.2.2...v1.6.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>