Update module github.com/stretchr/testify to v1.8.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/stretchr/testify	require	patch	v1.8.0 -> v1.8.4

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Release Notes

stretchr/testify (github.com/stretchr/testify)

### [`v1.8.4`](https://togithub.com/stretchr/testify/compare/v1.8.3...v1.8.4) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.8.3...v1.8.4) ### [`v1.8.3`](https://togithub.com/stretchr/testify/compare/v1.8.2...v1.8.3) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.8.2...v1.8.3) ### [`v1.8.2`](https://togithub.com/stretchr/testify/compare/v1.8.1...v1.8.2) [Compare Source](https://togithub.com/stretchr/testify/compare/v1.8.1...v1.8.2) ### [`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)

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