Update helm/chart-testing-action action to v2.8.0

.gitea/workflows/lint-test.yaml

@@ -170,13 +170,7 @@ jobs:
             helm dependency list --max-col-width 120 charts/$dir 2> /dev/null \
               | tail +2 | head -n -1 \
               | awk '{ print "helm repo add " $1 " " $3 }' \
-              | while read cmd; do
-                if [[ "$cmd" == "helm repo add oci:*" ]]; then
-                  echo ">> Ignoring OCI repo"
-                else
-                  echo "$cmd" | sh;
-                fi
-              done || true
+              | while read cmd; do echo "$cmd" | sh; done || true
           done
 
           if helm repo list | tail +2 | read -r; then