coredns helm values missing required tolerations for master deployment

In here: https://gitlab.cern.ch/kubernetes/automation/releases/cern-magnum/-/blob/master/values.yaml#L493

We're still missing some required tolerations. See the current magnum code: https://gitlab.cern.ch/kubernetes/magnum/-/blob/cern/train/magnum/drivers/common/templates/kubernetes/fragments/core-dns-service.sh#L126