Fix eosxd-csi repo URL
URL in https://gitlab.cern.ch/kubernetes/automation/releases/cern-magnum/-/blob/7f4935bab4f183f8cc5f444d510671be29544f45/Chart.yaml#L25 is wrong. eosxd-csi is being pushed to registry.cern.ch/kubernetes/charts (https://gitlab.cern.ch/kubernetes/storage/eosxd-csi/-/merge_requests/12).