[ferry_generator] support for latest dart_style

[kishormainali]

Ferry generator conflicts with freezed and other code generator due to old version of dart_style

Because every version of ferry_generator from path depends on dart_style ^2.3.2 and auto_route_generator 10.0.1 depends on dart_style ^3.0.1, ferry_generator from path is incompatible with auto_route_generator 10.0.1.
And because no versions of auto_route_generator match >10.0.1 <11.0.0, ferry_generator from path is incompatible with auto_route_generator ^10.0.1.
So, because graphql depends on both auto_route_generator ^10.0.1 and ferry_generator from path, version solving failed.
Failed to update packages.