Update Rock (#164)

Author: dragomirp

metadata.yaml

@@ -29,7 +29,7 @@ resources:
     type: oci-image
     description: OCI image for pgbouncer
     # Rock version, using pgbouncer v1.18.
-    upstream-source: ghcr.io/canonical/charmed-postgresql@sha256:1517d0053d6c039b42b5e2820c8f7a3eb13b67eee2b101fd1f562216eb4179ca
+    upstream-source: ghcr.io/canonical/charmed-postgresql@sha256:d3041e50c0d2f613db72228df912e510786644e57c9d2c22cde99db8ce83a5a9
 
 provides:
   database: