Incompatible with Java 11

[MaxiBoether]

When running TPCC with Java 11, the loading of data works fine, but on execution, you can observe almost no CPU utilization and very low tpM values. Java 10 works fine.

I did not do too much digging into this, but it could be that this Hikari PR could be linked to that, as the pom.xml specifies an older version of Hikari. Furthermore, I noticed that the pom-target of tpcc is version 10, anyways.