chore(deps): update helm release postgresql to v15

bke-development/gp-cicd-tools/Chart.yaml

@@ -15,7 +15,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 1.8.1
+version: 1.9.0
 
 dependencies:
   - name: argo-events
@@ -30,7 +30,7 @@ dependencies:
     condition: argo_workflows.enabled
   - name: postgresql
     repository: "https://charts.bitnami.com/bitnami"
-    version: ~13.4.0
+    version: ~15.5.0
     condition: argo_workflows.persistence
   - name: vela-core
     condition: baukasten.enabled