Use SCRAM-SHA-256 for home-assistant-db auth

[TheHackmeister]

Currently, it uses md5 in https://github.com/SciFiFarms/TechnoCore-Home-Assistant-DB/blob/master/data/pg_hba.conf

• https://github.com/cybertec-postgresql/pgwatch2/issues/77
• https://github.com/lib/pq/pull/608
• https://stackoverflow.com/questions/54460754/libpq-so-version-for-postgresql-10
• http://initd.org/psycopg/docs/install.html
• https://github.com/psycopg/psycopg2/issues/489
• https://www.postgresql.org/docs/9.1/auth-pg-hba-conf.html

[Neustradamus]

@TheHackmeister, @SciFiFarms: For information, it has been merged in lib/pq a long time ago:

• https://github.com/lib/pq/pull/833