pgbouncer config: auth_type = scram-sha-256

[boddumanohar]

SELECT usename, left(passwd,40) FROM pg_shadow WHERE usename='postgres';

-output

 usename  |                   left                   
----------+------------------------------------------
 postgres | SCRAM-SHA-256$4096:I+0OUdUjJqetAxwCtY3dN
(1 row)

postgres has a SCRAM-SHA-256 hash, but pgbouncer_pg18.ini uses auth_type = plain, which can't verify SCRAM passwords from auth_query.