[openstreetmap/openstreetmap-website] Fix Postgres.app PATH on macOS (PR #6340)

[naalpinist]

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### Description
In INSTALL.md:
```
- export PATH=/Applications/Postgres.app/Contents/MacOS/bin:$PATH
+ export PATH="/Applications/Postgres.app/Contents/Versions/latest/bin:$PATH"
```
The current path can lead to psql not being found. The CLI tools live under Contents/Versions/[version]/bin with a stable Versions/latest/bin symlink. 

### How has this been tested?
Docs change only. I verified locally on macOS by trying both paths and confirming psql only resolves from …/Versions/latest/bin. 

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6340

-- Commit Summary --

  * correct psql path

-- File Changes --

    M INSTALL.md (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6340.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6340.diff

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