chore: Update build dependency versions

Author: abraham

openapi-generator/pubspec.yaml

@@ -7,7 +7,7 @@ environment:
   sdk: '>=2.15.0 <4.0.0'
 
 dependencies:
-  build: '>=1.0.0 <=4.0.0'
+  build: '>=1.0.0 <=5.0.0'
   source_gen: '>=4.0.1 <=5.0.0'
   path: '>=1.0.0 <=2.0.0'
   openapi_generator_annotations: ^6.1.0