Because json_serializable >=6.11.3 depends on analyzer ^9.0.0 and go_router_builder >=4.1.1 depends on analyzer >=7.4.0 <9.0.0, json_serializable >=6.11.3 is incompatible with go_router_builder >=4.1.1.
So, because app depends on both go_router_builder ^4.1.1 and json_serializable ^6.11.3, version solving failed.
Failed to update packages.