fix(deps): remove dependency on hikariCP

[jcornaz]

The purpose of Hikari is to manage a connection pool. But as we only need a single (and ephemeral) connection to the database, I suggest we remove that dependency.

[ursjoss]

Makes sense, IMHO. The DB access we're changing here is only used for the generation of the DB scheme as type safe classes, not how the applications managed with jooq-gradle operate their own DB connection, right?

[jcornaz]

The DB access we're changing here is only used for the generation of the DB scheme as type safe classes, not how the applications managed with jooq-gradle operate their own DB connection, right?

Yes, that's right.