bump postgres major version to 18

unittests/helm/dependency-checks/major-image-bump.yaml

@@ -15,7 +15,7 @@ tests:
         matchRegex:
           path: spec.template.spec.containers[0].image
           # IN CASE OF AN INTENTIONAL MAJOR BUMP, ADJUST THIS TEST
-          pattern: bitnamilegacy/postgresql-repmgr:17.+$
+          pattern: bitnamilegacy/postgresql-repmgr:18.+$
   - it: "[postgresql] ensures we detect major image version upgrades"
     template: charts/postgresql/templates/primary/statefulset.yaml
     set:
@@ -28,7 +28,7 @@ tests:
         matchRegex:
           path: spec.template.spec.containers[0].image
           # IN CASE OF AN INTENTIONAL MAJOR BUMP, ADJUST THIS TEST
-          pattern: bitnamilegacy/postgresql:17.+$
+          pattern: bitnamilegacy/postgresql:18.+$
   - it: "[valkey-cluster] ensures we detect major image version upgrades"
     template: charts/valkey-cluster/templates/valkey-statefulset.yaml
     set: