docs: Update postgres aurora info

[tara-hpe]

Update instances of "postgresql <14", add note about Aurora v1

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[rb-determined-ai]

I talked to @stoksc, and it sounds like our official stance is that we support any non-EOL version of postgres.

So it is ok to say we recommend version 14 or later, but we can't say you need version 14 or later.

Personally, I think support EOL software is never implied, and we can mostly just say "Install Postgres" everywhere and people should know that EOL postgres isn't gonna work.

If you want to specify that we don't support non-EOL postgres, I'd do it only once, maybe in the setup-cluster/checklists/postgresql.rst file, or a file of equal specificity.

I would not tell users they should install postgresql-14 on debian, for instance; I think they should take whatever postgresql version is default for their linux installation (the unmarked postgresql package).

Does that all make sense?

[ioga]

Personally, I think support EOL software is never implied, and we can mostly just say "Install Postgres" everywhere and people should know that EOL postgres isn't gonna work.

I'd suggest we specify the minimum required version, since there's a slice of customers who run older systems, and CEs always end up asking us what's the minimum. Especially here where we know 12 is the minimum.

[stoksc]

We should at least say the minimum here still.

[stoksc]

Elsewhere I'd just recommend the newest Postgres version available.

[tara-hpe]

We should at least say the minimum here still.

Keeping "The solution requires PostgreSQL 14 or later, which will be installed on the admin node." in hpc-environment-requirements.rst file