bump vendored postgresql chart (#190)

* bump vendored postgresql chart

* fix formatting

charts/postgresql/Chart.yaml

@@ -1,14 +1,25 @@
 annotations:
   category: Database
+  images: |
+    - name: os-shell
+      image: docker.io/bitnami/os-shell:11-debian-11-r34
+    - name: postgres-exporter
+      image: docker.io/bitnami/postgres-exporter:0.13.2-debian-11-r15
+    - name: postgresql
+      image: docker.io/bitnami/postgresql:15.4.0-debian-11-r0
+  licenses: Apache-2.0
 apiVersion: v2
-appVersion: 11.14.0
+appVersion: 15.4.0
 dependencies:
 - name: common
-  repository: https://charts.bitnami.com/bitnami
-  version: 1.x.x
-description: Chart for PostgreSQL, an object-relational database management system
-  (ORDBMS) with an emphasis on extensibility and on standards-compliance.
-home: https://github.com/bitnami/charts/tree/master/bitnami/postgresql
+  repository: oci://registry-1.docker.io/bitnamicharts
+  tags:
+  - bitnami-common
+  version: 2.x.x
+description: PostgreSQL (Postgres) is an open source object-relational database known
+  for reliability and data integrity. ACID-compliant, it supports foreign keys, joins,
+  views, triggers and stored procedures.
+home: https://bitnami.com
 icon: https://bitnami.com/assets/stacks/postgresql/img/postgresql-stack-220x234.png
 keywords:
 - postgresql
@@ -18,12 +29,9 @@ keywords:
 - replication
 - cluster
 maintainers:
-- email: containers@bitnami.com
-  name: Bitnami
-- email: cedric@desaintmartin.fr
-  name: desaintmartin
+- name: VMware, Inc.
+  url: https://github.com/bitnami/charts
 name: postgresql
 sources:
-- https://github.com/bitnami/bitnami-docker-postgresql
-- https://www.postgresql.org/
-version: 10.16.2
+- https://github.com/bitnami/charts/tree/main/bitnami/postgresql
+version: 12.8.2