Updated makefile

Makefile

@@ -128,6 +128,6 @@ update-velero:
 update-nifi:
 	@echo "Updating NiFi"
 	@rm -rf external/$(patsubst update-%,%,$@)
-	@helm repo add $(patsubst update-%,%,$@) https://artifacthub.io/packages/helm/cetic/nifi
+	@helm repo add $(patsubst update-%,%,$@) https://cetic.github.io/helm-charts
 	@helm pull -d external --untar $(patsubst update-%,%,$@)/$(patsubst update-%,%,$@)
 	@echo ""