Update postgres Docker tag to v14

[renovate]

This PR contains the following updates:

Package	Update	Change
postgres	major	13-alpine -> 14-alpine

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[kkthxbye-code]

For reference EoL of postgres v13 is November 13, 2025, v14 was released yesterday and netbox currently requires v9.6, soon v10 in netbox 3.1.

While it doesn't really matter, because I assume most people pin their postgres version in docker-compose, I don't think it is worth it to change the default, as there will certainly be tickets again regarding the postgres container not starting after a docker-compose pull.

[cimnine]

as there will certainly be tickets again regarding the postgres container not starting after a docker-compose pull.

This is true. But IMO it doesn't really matter, since we'll just have the tickets when they will finally have to upgrade. When we upgrade regularly, at least the users that start out with the latest PostgreSQL version will have the most time to stick to the PostgreSQL version which they started with. Plus they learn to read the release notes early on ;-)

So if a user today starts with PostgreSQL 14, that user will likely have 5 years until an upgrade is needed.

[cimnine]

This change should only be included in a minor update, not in a patch update.