Installer updates for the August 2026 6.0.3 release

[ValClarkson]

Regenerated from operator-installers with
release-artifacts/prerelease/developer/release-manifest-ubi9.yaml and copied into config/ via make publish-public-installers.

Image tags moved from calver 2621 -> 2633 with the following version bumps (mirrors versioning.yaml):

• postgres-operator 6.0: 6.0.2-0 -> 6.0.3-0
• postgres-operator 5.8: 5.8.8-0 -> 5.8.9-0
• crunchy-pgadmin4: ubi9-9.15 -> ubi9-9.17
• crunchy-pgbackrest: ubi9-2.58.0 -> ubi9-2.59.0
• crunchy-postgres-exporter: ubi9-0.18.1 -> ubi9-0.19.1
• crunchy-postgres 15/16/17/18: 15.18/16.14/17.10/18.4 ->
  15.19/16.15/17.11/18.6 (and matching -gis variants)
• crunchy-pgbouncer: ubi9-1.25 (unchanged upstream, calver-only bump)

app.kubernetes.io/version bumped 6.0.2 -> 6.0.3 in config/default/kustomization.yaml, config/singlenamespace/kustomization.yaml, and the three CRD label sets (pgadmins, pgupgrades, postgresclusters).

config/rbac/cluster/kustomization.yaml resource list reordered alphabetically by the installer generator (role.yaml before role_binding.yaml); functionally equivalent.

Checklist:

• Have you added an explanation of what your changes do and why you'd like them to be included?
• Have you updated or added documentation for the change, as applicable?
• Have you tested your changes on all related environments with successful results, as applicable?
  • Have you added automated tests?

Type of Changes:

• New feature
• Bug fix
• Documentation
• Testing enhancement
• Other

What is the current behavior (link to any open issues here)?

What is the new behavior (if this is a feature change)?

• Breaking change (fix or feature that would cause existing functionality to change)

Other Information: