Fix deprecation message for GoRouterState.namedLocation (flutter#3092)

Fix deprecation message for `GoRouterState.namedLocation` -- it should
point to `GoRouter.of(context).namedLocation`, not
`GoRouter.of(context).routeInformationParser.namedLocation` (the latter
does not exist).

Previously mentioned here: flutter/packages@bdc07b6#r88804919

Author: jorgenpt

packages/go_router/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 6.0.9
+
+- Fixes deprecation message for `GoRouterState.namedLocation`
+
 ## 6.0.8
 
 * Adds support for Iterables, Lists and Sets in query params for TypedGoRoute. [#108437](https://github.com/flutter/flutter/issues/108437).

packages/go_router/lib/src/state.dart

@@ -122,8 +122,7 @@ class GoRouterState {
 
   /// Get a location from route name and parameters.
   /// This is useful for redirecting to a named location.
-  @Deprecated(
-      'Uses GoRouter.of(context).routeInformationParser.namedLocation instead')
+  @Deprecated('Use GoRouter.of(context).namedLocation instead')
   String namedLocation(
     String name, {
     Map<String, String> params = const <String, String>{},

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: 6.0.8
+version: 6.0.9
 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