enable operator support for pg15 and drop support for 9.5 and 9.6 (#2140)

* enable operator support for pg15 and drop support for 9.5 and 9.6
* not offer 15 in UI before spilo-15 is available

manifests/configmap.yaml

@@ -97,7 +97,7 @@ data:
   # max_memory_request: 4Gi
   # min_cpu_limit: 250m
   # min_memory_limit: 250Mi
-  # minimal_major_version: "9.6"
+  # minimal_major_version: "11"
   # node_readiness_label: "status:ready"
   # node_readiness_label_merge: "OR"
   # oauth_token_secret_name: postgresql-operator

manifests/operatorconfiguration.crd.yaml

@@ -165,7 +165,7 @@ spec:
                       type: string
                   minimal_major_version:
                     type: string
-                    default: "9.6"
+                    default: "11"
                   target_major_version:
                     type: string
                     default: "14"

manifests/postgresql-operator-default-configuration.yaml

@@ -39,7 +39,7 @@ configuration:
     major_version_upgrade_mode: "off"
     # major_version_upgrade_team_allow_list:
     # - acid
-    minimal_major_version: "9.6"
+    minimal_major_version: "11"
     target_major_version: "14"
   kubernetes:
     # additional_pod_capabilities:

manifests/postgresql.crd.yaml

@@ -365,13 +365,12 @@ spec:
                   version:
                     type: string
                     enum:
-                      - "9.5"
-                      - "9.6"
                       - "10"
                       - "11"
                       - "12"
                       - "13"
                       - "14"
+                      - "15"
                   parameters:
                     type: object
                     additionalProperties: