fix(deps): Update module github.com/stretchr/testify to v1.8.0

[cq-bot]

This PR contains the following updates:

Package	Type	Update	Change
github.com/stretchr/testify	require	minor	v1.7.5 -> v1.8.0

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Release Notes

stretchr/testify

### [`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)

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