build(deps): bump github.com/prometheus/client_golang from 1.15.1 to 1.16.0#308

dependabot[bot] wants to merge 1 commit intomasterlivepeer/stream-tester:masterfrom

dependabot/go_modules/github.com/prometheus/client_golang-1.16.0livepeer/stream-tester:dependabot/go_modules/github.com/prometheus/client_golang-1.16.0Copy head branch name to clipboard