Update Helm release postgresql to v18 (#2980)

Author: renovate[bot]

charts/selenium-grid/CONFIGURATION.md

@@ -18,7 +18,7 @@ A Helm chart for creating a Selenium Grid Server in Kubernetes
 
 | Repository | Name | Version |
 |------------|------|---------|
-| https://charts.bitnami.com/bitnami | postgresql | ^16 |
+| https://charts.bitnami.com/bitnami | postgresql | ^18.0.0 |
 | https://charts.bitnami.com/bitnami | redis | ^22.0.0 |
 | https://jaegertracing.github.io/helm-charts | jaeger | ^3 |
 | https://kedacore.github.io/charts | keda | ^2.17 |

charts/selenium-grid/Chart.yaml

@@ -23,7 +23,7 @@ dependencies:
   name: kube-prometheus-stack
   condition: monitoring.enabled, kube-prometheus-stack.enabled
 - repository: https://charts.bitnami.com/bitnami
-  version: ^16
+  version: ^18.0.0
   name: postgresql
   condition: postgresql.enabled
 - repository: https://charts.bitnami.com/bitnami