delete extra slash

magnum/drivers/common/templates/kubernetes/helm/cern-chart.sh

@@ -336,7 +336,7 @@ data:
 
     CHART_REPO="oci://$(echo ${CONTAINER_INFRA_PREFIX} | sed -n 's#[http(s)://]*\(.*cern.ch\).*#\1#p')/kubernetes/charts"
     if [[ ( $(echo ${CERN_CHART_VERSION} | cut -d. -f2) -le 13 ) ]]; then
-        CHART_REPO="releases/"
+        CHART_REPO="releases"
         helm repo add releases https://$(echo ${CONTAINER_INFRA_PREFIX} | sed -n 's#[http(s)://]*\(.*cern.ch\).*#\1#p')/chartrepo/releases
         helm repo update
     fi