Update version number

Author: ValentinVignal

packages/go_router/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 15.2.1
+
+- Updates Type-safe routes topic documentation to use the mixin from `go_router_builder` 3.0.0.
+
 ## 15.2.0
 
 - `GoRouteData` now defines `.location`, `.go(context)`, `.push(context)`, `.pushReplacement(context)`, and `replace(context)` to be used for [Type-safe routing](https://pub.dev/documentation/go_router/latest/topics/Type-safe%20routes-topic.html). **Requires go_router_builder >= 3.0.0**.

packages/go_router/pubspec.yaml

@@ -1,7 +1,7 @@
 name: go_router
 description: A declarative router for Flutter based on Navigation 2 supporting
   deep linking, data-driven routes and more
-version: 15.2.0
+version: 15.2.1
 repository: https://github.com/flutter/packages/tree/main/packages/go_router
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+go_router%22