Bumped SDK & Flutter requirements to align with FM v8

Author: JaffaKetchup

pubspec.yaml

@@ -23,8 +23,8 @@ platforms:
   windows:
 
 environment:
-  sdk: ">=3.3.0 <4.0.0"
-  flutter: ">=3.19.0"
+  sdk: ">=3.6.0 <4.0.0"
+  flutter: ">=3.27.0"
 
 dependencies:
   async: ^2.11.0