chore(deps): bump github.com/stretchr/testify from 1.8.0 to 1.8.1

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](https://github.com/stretchr/testify/compare/v1.8.0...v1.8.1)

go.mod

@@ -4,5 +4,5 @@ go 1.15
 
 require (
 	github.com/apex/log v1.9.0
-	github.com/stretchr/testify v1.8.0
+	github.com/stretchr/testify v1.8.1
 )