Update json-schema-core dependency

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
Fix two incorrect message picks from the core

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
Get rid of references to JsonReferenceError

It is removed from -core...

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
2.1.6