refact(jdbc): using jdbc-url instead db-specs

[rafaeldelboni]

From next-jdbc docs:

If you need to pass in extra connection URL parameters, it can be easier to use next.jdbc.connection/jdbc-url to construct URL, e.g.,

(connection/->pool com.zaxxer.hikari.HikariDataSource
                   {:jdbcUrl
                    (connection/jdbc-url {:dbtype "mysql" :dbname "thedb" :useSSL false})
                    :username "dbuser" :password "secret"})

Here we pass :useSSL false to jdbc-url so that it ends up in the connection string, but pass :username and :password for the pool itself.

[rafaeldelboni]

Seems working fine on old app using this lib
rafaeldelboni/super-dice-roll-clj#25

[rafaeldelboni]

clj-codes/docs.backend@2976c2f

Strangely, even if I switch to true in this fly.io app it still works, but create a connection without ssl