feat: updated default postgresql version

[Ani1357]

APL-282
This PR updates the default of the postgresql version used for a cnpg database.

[merll]

I think offering the image catalog in the charts is a good idea, but I think we should not make this restrictive on the platform versions.

I could imagine the following scenarios:

• Users want to migrate their DB here. They can test a recovery here, but if they use basebackup + WAL instead of a dump, and their database is not version 17 yet, this will not work.
• There might be products and libraries that are not compatible with, or at least do not officially support PG 17 yet.
• There are dozens of drop-in replacements for the official PostgreSQL images, which are not forks but just a packaged PG+Extensions. They often play well with CNPG and I think we should not unnecessarily obstruct their use in the chart. One example is TimescaleDB.

Also users running a production DB could face pod restarts in case of a platform upgrade, something that is not necessary and possibly unexpected.

Adding imageCatalogName and imageCatalogKind (for example) with the defaults would accommodate this, because then teams can even maintain their own ImageCatalog.

[j-zimnowoda]

We need to wait until new APL version is released

New APL version released.