fix: slide smithy_codegen window

Author: Equartey

packages/smithy/smithy_codegen/pubspec.yaml

@@ -30,8 +30,8 @@ dependencies:
   pubspec_parse: ^1.2.0
   shelf: ^1.1.0
   shelf_router: ^1.1.0
-  smithy: ">=0.5.0 <0.6.0"
-  smithy_aws: ">=0.5.0 <0.6.0"
+  smithy: ">=0.6.0 <0.7.0"
+  smithy_aws: ">=0.6.0 <0.7.0"
   tuple: ^2.0.0
   xml: 6.3.0
   yaml_edit: ^2.0.1