Update dependency rxdart_ext to ^0.3.0

Author: renovate[bot]

pubspec.yaml

@@ -37,7 +37,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
-  rxdart_ext: ^0.2.9
+  rxdart_ext: ^0.3.0
   dart_either: ^1.0.0
   flutter_bloc_pattern: ^2.3.0
   flutter_provider: ^2.1.0