fix: avoid logging database password and username

[svalasovich]

Fix Database Password leak in logs

When the sink connects to the database, it prints the full DSN including the password.
{"logger":"sink-sql.postgres","message":"connecting to db","dsn":"... password=... ", "logging.googleapis.com/labels":{}}
This exposes sensitive credentials in logs and can lead to a security breach.

This update logs non sensitive connection parameters only.