fix: PG 15 backups working by default (#2246)

In 30b6124 this update was forgotten. It is needed for logical backups of postgres 15 clusters, as seen in #1945 (comment).

Fix #1945.

@moduon MT-1075

Author: yajo

charts/postgres-operator/values.yaml

@@ -348,7 +348,7 @@ configLogicalBackup:
   # logical_backup_memory_request: ""
 
   # image for pods of the logical backup job (example runs pg_dumpall)
-  logical_backup_docker_image: "registry.opensource.zalan.do/acid/logical-backup:v1.8.0"
+  logical_backup_docker_image: "registry.opensource.zalan.do/acid/logical-backup:v1.9.0"
   # path of google cloud service account json file
   # logical_backup_google_application_credentials: ""