Add support for pg18 and remove pg13 (#3035)

* Add support for pg18 and remove pg13
* Update general spilo image and use new rebuilt e2e spilo image

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Co-authored-by: Polina Bungina <polina.bungina@zalando.de>

charts/postgres-operator/values.yaml

@@ -31,14 +31,12 @@ configGeneral:
   enable_pgversion_env_var: true
   # start any new database pod without limitations on shm memory
   enable_shm_volume: true
-  # enables backwards compatible path between Spilo 12 and Spilo 13+ images
-  enable_spilo_wal_path_compat: false
   # operator will sync only clusters where name starts with teamId prefix
   enable_team_id_clustername_prefix: false
   # etcd connection string for Patroni. Empty uses K8s-native DCS.
   etcd_host: ""
   # Spilo docker image
-  docker_image: ghcr.io/zalando/spilo-17:4.0-p3
+  docker_image: ghcr.io/zalando/spilo-18:4.1-p1
 
   # key name for annotation to ignore globally configured instance limits
   # ignore_instance_limits_annotation_key: ""
@@ -96,9 +94,9 @@ configMajorVersionUpgrade:
   # - acid
 
   # minimal Postgres major version that will not automatically be upgraded
-  minimal_major_version: "13"
+  minimal_major_version: "14"
   # target Postgres major version when upgrading clusters automatically
-  target_major_version: "17"
+  target_major_version: "18"
 
 configKubernetes:
   # list of additional capabilities for postgres container