chore: bump app_links to '>=6.2.0 <8.0.0' (#1282)

* chore: Bump app_links to ^7.0.0

* Bump Dart SDK version

* Bump Flutter version to match SDK version

* Allow both major versions of app_links

Author: spydon

packages/supabase_flutter/pubspec.yaml

@@ -10,7 +10,7 @@ environment:
   flutter: '>=3.19.0'
 
 dependencies:
-  app_links: ^6.2.0
+  app_links: '>=6.2.0 <8.0.0'
   async: ^2.11.0
   crypto: ^3.0.2
   flutter: