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

clusters/cl01tl/helm/matrix-synapse/Chart.lock

@@ -19,7 +19,7 @@ dependencies:
   version: 3.3.1
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 7.14.0
+  version: 7.15.0
 - name: valkey
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 0.8.0
@@ -38,5 +38,5 @@ dependencies:
 - name: volsync-target
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 2.0.0
-digest: sha256:8e6ede4ed96bced61b2b0aeba86486694576bfde8e7de8661f228c545146f0d1
-generated: "2026-05-19T16:05:18.661491255Z"
+digest: sha256:8d0e1b39fd23b1acba5b35bda4b00d1f2268b572b4b0bc6aad3abd2ea27f95fc
+generated: "2026-05-19T16:31:26.355975381Z"