Migrate Dockerfile to use golang 1.21 to match go.mod in project#1857

k8s-ci-robot merged 1 commit intokubernetes-sigs:mainkubernetes-sigs/cluster-api-provider-openstack:mainfrom

elastx:dockerfile-go-1.21elastx/cluster-api-provider-openstack:dockerfile-go-1.21Copy head branch name to clipboard