Update module github.com/stretchr/testify to v1.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/stretchr/testify	require	minor	v1.7.0 -> v1.8.1

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Release Notes

stretchr/testify

### [`v1.8.1`](https://togithub.com/stretchr/testify/compare/v1.8.0...v1.8.1) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.8.0...v1.8.1) ### [`v1.8.0`](https://togithub.com/stretchr/testify/compare/v1.7.5...v1.8.0) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.7.5...v1.8.0) ### [`v1.7.5`](https://togithub.com/stretchr/testify/compare/v1.7.4...v1.7.5) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.7.4...v1.7.5) ### [`v1.7.4`](https://togithub.com/stretchr/testify/compare/v1.7.3...v1.7.4) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.7.3...v1.7.4) ### [`v1.7.3`](https://togithub.com/stretchr/testify/compare/v1.7.2...v1.7.3) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.7.2...v1.7.3) ### [`v1.7.2`](https://togithub.com/stretchr/testify/compare/v1.7.1...v1.7.2) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.7.1...v1.7.2) ### [`v1.7.1`](https://togithub.com/stretchr/testify/compare/v1.7.0...v1.7.1) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.7.0...v1.7.1)

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Configuration

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