Changed volume to match upstream image

[tobiasge]

Related Issue: docker-library/postgres#1259

New Behavior

• Volume was changed in PostgreSQL image

Contrast to Current Behavior

• Old data path was used

Discussion: Benefits and Drawbacks

• None

Changes to the Wiki

• Change mount paths

Proposed Release Note Entry

• Mention with the change to PostgreSQL 18

Double Check

• I have read the comments and followed the PR template.
• I have explained my PR according to the information in the comments.
• My PR targets the develop branch.

[tobiasge]

@cimnine Can you take a look at this. We should add it before a new release for Netbox 4.5.

[cimnine]

Proposed Release Note Entry

I think you should explicitly mention that the mount path changed. Most will not care, but let's not make it a surprise for those who did something with it anyway.