muster release v5.20.1

Changed

• The muster and muster-crds chart READMEs no longer render a version badge (chart.badgesSection removed from both README.md.gotmpl files): a release PR bumping Chart.yaml’s version or appVersion no longer changes the checked-in README.md, so the helm-docs pre-commit hook no longer fails on it. (giantswarm/devctl#2180)