Bump github.com/stretchr/testify from 1.7.2 to 1.8.0

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.7.2 to 1.8.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](https://github.com/stretchr/testify/compare/v1.7.2...v1.8.0)

---
updated-dependencies:
- dependency-name: github.com/stretchr/testify
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -62,7 +62,7 @@ require (
 	github.com/sclevine/spec v1.4.0
 	github.com/spf13/cobra v1.4.0
 	github.com/spf13/pflag v1.0.5
-	github.com/stretchr/testify v1.7.2
+	github.com/stretchr/testify v1.8.0
 	github.com/tdewolff/minify/v2 v2.11.9
 	go.uber.org/atomic v1.9.0
 	go.uber.org/zap v1.21.0