chore(deps): update postgres-cluster docker tag to v7.9.1

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

@@ -19,7 +19,7 @@ dependencies:
   version: 2.4.0
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 7.8.0
+  version: 7.9.1
 - name: valkey
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 0.4.0
@@ -38,5 +38,5 @@ dependencies:
 - name: volsync-target
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 0.8.0
-digest: sha256:fc6e3a04b828daf3a0861aec6a7a6d1c9a45fabaf29abd3fb3be2e8db4d0875b
-generated: "2026-03-09T23:08:07.610958823Z"
+digest: sha256:3b61539bbe5efd66392178ded30fc80f23ca1bb54c1e552ab183037e478ad2a0
+generated: "2026-03-11T21:21:56.807243812Z"