Stop using old Java 8 time classes

[ryanrdoherty]

A recent Jackson upgrade (2.18.3) resulted in the following runtime exception when visiting the vdi-datasets endpoint:

Java 8 date/time type `java.time.OffsetDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: java.util.ArrayList[0]->org.veupathdb.service.vdi.generated.model.DatasetListEntryImpl["created"])

As requested, I added "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" as a dependency and it resolved the issue, but we should probably find the modern alternative to java.time.OffsetDateTime and use it instead, then remove the additional dependency.

[ryanrdoherty]

This was fixed with removal of Jersey's Jackson filter, in #389