chore: upgrade pubspec.yaml version

Author: Zigotote

pubspec.yaml

@@ -1,7 +1,7 @@
 name: flutter_carousel_widget
 description: A customizable Flutter carousel widget with infinite scrolling, auto-scrolling, pre-built indicators, expandable widgets, auto-sized child support, and enlarged center page.
 
-version: 3.1.0
+version: 3.1.1
 
 homepage: https://pub.dev/packages/flutter_carousel_widget
 repository: https://github.com/nixrajput/flutter_carousel_widget