chore(deps): update module stretchr/testify to v1.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/stretchr/testify	require	minor	v1.6.1 -> v1.7.0

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Release Notes

stretchr/testify

### [`v1.7.0`](https://togithub.com/stretchr/testify/releases/v1.7.0) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.6.1...v1.7.0) Minor feature improvements and bug fixes

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[wennmo]

@glooms @axelssonHakan - removed the testing of golang 1.11 and 1.12 in CCI, since it is no longer supported by stretchr/testify