Update module stretchr/testify to v1.5.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/stretchr/testify	require	minor	v1.4.0 -> v1.5.1

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Release Notes

stretchr/testify

### [`v1.5.1`](https://togithub.com/stretchr/testify/releases/v1.5.1) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.5.0...v1.5.1) This is a hotfix which reverts the `suite` package's interface type to use `testing.T` ### [`v1.5.0`](https://togithub.com/stretchr/testify/releases/v1.5.0) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.4.0...v1.5.0) Latest, non-breaking changes merged into master. Please peruse the git log for a detailed changelist

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