Merge pull request #5509 from grafana/helm-release/1.15.3

Merge: Release oncall Helm chart 1.15.3

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: 1.15.2
-appVersion: v1.15.2
+version: 1.15.3
+appVersion: v1.15.3
 dependencies:
   - name: cert-manager
     version: v1.8.0