Merge pull request #5511 from grafana/helm-release/1.15.4

Merge: Release oncall Helm chart 1.15.4

Author: grafana-irm-app[bot]

helm/oncall/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: oncall
 description: Developer-friendly incident response with brilliant Slack integration
 type: application
-version: 1.15.3
-appVersion: v1.15.3
+version: 1.15.4
+appVersion: v1.15.4
 dependencies:
   - name: cert-manager
     version: v1.8.0