[issue2551255] Add support for psycopg3 library

New submission from John Rouillard:

Looks like psycopg3 is at release 3.1 > 3.0 so we should plan on how to use/test etc.

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components: Database
messages: 7708
nosy: rouilj
severity: normal
status: new
title: Add support for psycopg3 library
type: rfe

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