build: bump version to 1.2.0

- Update version in pubspec.yaml from 1.1.0 to 1.2.0

Author: fulleni

pubspec.yaml

@@ -2,7 +2,7 @@ name: flutter_news_app_web_dashboard_full_source_code
 description: "A Flutter web application for comprehensive content management and administration within the Flutter News App Full Source Code Toolkit."
 repository: https://github.com/flutter-news-app-full-source-code/flutter-news-app-web-dashboard-full-source-code
 publish_to: none
-version: 1.1.0
+version: 1.2.0
 
 environment:
   sdk: ^3.9.0