Maintenance: naive datetime in asyncpg and aiopg queries

[pcrespov]

Why cannot add expires_at in asyncpg using a non-naive datetime while it works with aiopg?

SEE:

          sure about using utcnow?

_Originally posted by @sanderegg in https://github.com/ITISFoundation/osparc-simcore/pull/3962#discussion_r1141466239_

[pcrespov]

• basically use arrow everywhere or datetime.utc properly
• redefine datetime cols in database. See timezone: bool option in some free functions at packages/postgres-database/src/simcore_postgres_database/models/_common.py
• delicate for database migration
• tried once and had lots of troubles

[pcrespov]

This is duplicated in https://github.com/ITISFoundation/osparc-simcore/issues/3797