One more dependency bump

PiperOrigin-RevId: 200771457

Author: nshahan

pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
   angular_forms: 2.0.0-alpha+7
   async: ^2.0.6
   build: '>=0.11.1 <0.13.0'
-  build_config: ^0.2.6
+  build_config: '>=0.2.6 <0.4.0'
   built_collection: '>=1.6.0 <4.0.0'
   collection: ^1.14.10
   fixnum: ^0.10.5