Bump github.com/prometheus/prometheus from 0.308.0 to 0.309.1#57

dependabot[bot] wants to merge 1 commit intomasterobservatorium/up:masterfrom

dependabot/go_modules/github.com/prometheus/prometheus-0.309.1observatorium/up:dependabot/go_modules/github.com/prometheus/prometheus-0.309.1Copy head branch name to clipboard