Update requirements_test.txt for psycopg3

[jimchamp]

Completely untested.

requirements_test.txt is used by our python_tests workflow. Let's see if everything works.

[jimchamp]

In order for this to work, tests (and likely Infogami) will have to be rewritten such that they do not use WebPy's db module.

WebPy only accepts psycopg2 drivers for postgres connections today.

Here is the error stack trace for one of the failing tests:

infogami/infobase/tests/utils.py:88: in setup_site
    setup_db(mod)
infogami/infobase/tests/utils.py:35: in setup_db
    recreate_database()
/opt/hostedtoolcache/Python/3.12.13/x64/lib/python3.12/site-packages/web/utils.py:510: in __call__
    update(block=True)
/opt/hostedtoolcache/Python/3.12.13/x64/lib/python3.12/site-packages/web/utils.py:505: in update
    self.cache[key] = (self.func(*args, **keywords), time.time())
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
infogami/infobase/tests/utils.py:27: in recreate_database
    db = web.database(**db_parameters)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/opt/hostedtoolcache/Python/3.12.13/x64/lib/python3.12/site-packages/web/db.py:1479: in database
    return _databases[dbn](**params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
/opt/hostedtoolcache/Python/3.12.13/x64/lib/python3.12/site-packages/web/db.py:1195: in __init__
    db_module = import_driver(pg_drivers, preferred=keywords.pop("driver", None))
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

As per:
https://github.com/webpy/webpy/blob/d3649322b85777b291ac2b7b3699fb6fc839e382/web/db.py#L48

https://github.com/webpy/webpy/blob/d3649322b85777b291ac2b7b3699fb6fc839e382/web/db.py#L1261-L1271