[go_router] Go router type safe route topic is outdated #170574
Description
Steps to reproduce
When using go_router 15.2.0 and go_router_builder ^2.0.0, an error is thrown:
══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
The following UnimplementedError was thrown while handling a gesture:
Should be generated using [Type-safe
routing](https://pub.dev/documentation/go_router/latest/topics/Type-safe%20routes-topic.html).
When the exception was thrown, this was the stack:
#0 GoRouteData.push (package:go_router/src/route_data.dart:144:47)
But the link doesn't mention the mixin that needs to be used
