Fixes https://github.com/emqx/emqx/issues/9907
At v5.0.14, we changed the `ssl` option for the Postgres connector
from `true` to `required`, but there was another transformation in
`conn_opts/2` that led to an incorrect configuration. This change
ended up preventing users from connecting to Postgres with their
previous configurations after upgrading EMQX.
Thales Macedo Garitezi