Bump github.com/stretchr/testify from 1.8.0 to 1.8.1 in /server#186

dependabot[bot] wants to merge 1 commit intomainsimulgames/Simul.Games:mainfrom

dependabot/go_modules/server/github.com/stretchr/testify-1.8.1simulgames/Simul.Games:dependabot/go_modules/server/github.com/stretchr/testify-1.8.1Copy head branch name to clipboard