fix(deps): update dependency rxdart_ext to ^0.3.0

Author: renovate[bot]

pubspec.yaml

@@ -30,7 +30,7 @@ dependencies:
   disposebag: ^1.5.1
   flutter_disposebag: ^1.1.0
   flutter_bloc_pattern: ^2.3.0
-  rxdart_ext: ^0.2.7
+  rxdart_ext: ^0.3.0
   did_change_dependencies: ^1.0.0
   stream_loader: ^1.5.0
   dart_either: ^1.0.0