build: downgrade intl package

- Downgraded intl package
- Resolved compatibility issues

Author: fulleni

pubspec.yaml

@@ -50,7 +50,7 @@ dependencies:
   ht_shared:
     git:
       url: https://github.com/headlines-toolkit/ht-shared.git
-  intl: ^0.20.2
+  intl: ^0.19.0
   meta: ^1.16.0
   share_plus: ^11.0.0
   stream_transform: ^2.1.1