* Add HikariCP connection pool for MySQL
* Make code more compatible with connection pooling
- Remove connection caching in Process/Consumer
- Use try-with-resources to make sure Connections always get closed, even in
when an Exception occurs.
* Disable SSL for MySQL
* Use HTTPS for sk89q maven repo
Newer Maven releases don't allow use of http endpoints. Bump this to the secure https endpoint.
* Migrate sk89q maven repo to enginehub
Both URLs point to the same place, but according to https://worldguard.enginehub.org/en/latest/developer/dependency/ enginehub is the preferred source.
* Bump Java to Adoptium Hotspot JDK 11
