Remove support for Jackson2
Remove support for Jackson2

It was added to resolve JSON as parent context, but the `combine` method only requires Maps, so it is no longer needed
rfuertesp/pruebas2,sphereio/sphere-sunrise,sphereio/sphere-sunrise,sphereio/sphere-sunrise,commercetools/commercetools-sunrise-java,commercetools/commercetools-sunrise-java,sphereio/commercetools-sunrise-java,commercetools/commercetools-sunrise-java,rfuertesp/pruebas2,sphereio/sphere-sunrise,rfuertesp/pruebas2,sphereio/commercetools-sunrise-java,rfuertesp/pruebas2,sphereio/commercetools-sunrise-java,commercetools/commercetools-sunrise-java,sphereio/commercetools-sunrise-java