update minimum to Flutter 3.38.3 (Dart 3.10.1) (#415)

Author: PaulAllanSturm

pubspec.yaml

@@ -5,7 +5,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: '>=3.9.0 <4.0.0'
+  sdk: '>=3.10.1 <4.0.0'
 
 dependencies:
   arcgis_maps: ^300.0.0