Update ghcr.io/cloudnative-pg/postgresql Docker tag to v17.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/cloudnative-pg/postgresql	final	minor	17.0-3 -> 17.2-3

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[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the PostgreSQL base image version from 17.0-3 to 17.2-3 in the custom CloudNative PostgreSQL Dockerfile. This is a minor version update that maintains the same major version (17.x).

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Update PostgreSQL base image version	Bump CloudNative PostgreSQL image version from 17.0-3 to 17.2-3	docker/custom-images/custom-cnpg.Dockerfile

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[sourcery-ai]

We have skipped reviewing this pull request. It seems to have been created by a bot (hey, renovate[bot]!). We assume it knows what it's doing!