[go_router_builder] Temporarily restrict build (#9453)

Adds an upper bound of `build` 2.4.x, to work around what seems to have been an accidental breaking change released in `build` 2.5, causing out-of-band build breakage that has closed the tree.

This should allow the tree to re-open.

See flutter/flutter#170832

## Pre-Review Checklist

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

Author: stuartmorgan-g

packages/go_router_builder/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+- Restricts `build` to versions less than 2.5.0.
+
 ## 3.0.1
 
 - Updates README.md to use the mixin `with _$RouteName`.
@@ -20,7 +24,7 @@
 
 ## 2.8.1
 
-- Fixes an issue when navigate to router with invalid params 
+- Fixes an issue when navigate to router with invalid params
 
 ## 2.8.0
 

packages/go_router_builder/pubspec.yaml

@@ -13,7 +13,10 @@ environment:
 dependencies:
   analyzer: ">=6.9.0 <8.0.0"
   async: ^2.8.0
-  build: ^2.0.0
+  # The upper bound is to work around a breaking change in `build` that was not
+  # versioned according to semver, and broke `build_test` 2.x. See
+  # https://github.com/flutter/flutter/issues/170832
+  build: ">=2.0.0 <2.5.0"
   build_config: ^1.0.0
   collection: ^1.14.0
   meta: ^1.7.0