fix(deps): update dependency build to v4

Author: renovate[bot]

pubspec.yaml

@@ -8,7 +8,7 @@ environment:
   sdk: ">=2.19.0 <4.0.0"
 
 dependencies:
-  build: ^3.0.0
+  build: ^4.0.0
   path: ^1.9.1
   recase: ^4.1.0
   source_gen: ^3.0.0