Update to geojson-jackson ≥ 3 and Jackson 3

[dersvenhesse]

The gbfs-java-model currently uses geojson-jackson 1.14. This version should be updated to geojson-jackson 3.0 with support for Jackson 3.

[testower]

This is a headache (example entur/lamassu#882).

Since this would be a breaking change it needs a new major version of the library. That probably also means maintaining parallell support for jackson 2. This is a horrible prospect for something as trivial as MultiPolygon support.

A much more tractable alternative is to handroll a MultiPolygon type.