Update module stretchr/testify to v1.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/stretchr/testify	require	patch	v1.6.0 -> v1.6.1

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Release Notes

stretchr/testify

### [`v1.6.1`](https://togithub.com/stretchr/testify/releases/v1.6.1) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.6.0...v1.6.1) A breaking change was accidentally released in v1.6.0 which breaks the API for the `HTTPBodyContains` and `HTTPBodyNotContains`, this release reverts that change.

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