chore(deps): update postgres-cluster docker tag to v7.15.0

clusters/cl01tl/helm/gitea/Chart.lock

@@ -13,7 +13,7 @@ dependencies:
   version: 3.3.1
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 7.13.3
+  version: 7.15.0
 - name: valkey
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 0.8.0
@@ -23,5 +23,5 @@ dependencies:
 - name: volsync-target
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 2.0.0
-digest: sha256:f757e7f74505313dfc1837ae446bccb7dc9dc7a954b6da67de3a75f4686403b0
-generated: "2026-05-18T20:35:44.652288341Z"
+digest: sha256:34bef18e6f56091f1a9822dd243cda4b17ba07783d4c8635165e5ada2dcaa4ad
+generated: "2026-05-19T01:06:34.922488263Z"