chore(deps): update index.docker.io/sourcegraph/prometheus docker tag to v6.1.2889#1176

renovate[bot] merged 1 commit intomainsourcegraph/deploy-sourcegraph-docker:mainfrom

renovate/sourcegraph-prometheus-grafana-docker-imagessourcegraph/deploy-sourcegraph-docker:renovate/sourcegraph-prometheus-grafana-docker-imagesCopy head branch name to clipboard