cleanup code a bit

pubspec.yaml

@@ -2,25 +2,25 @@ name: wanikani_kanji_srs
 description: A modern Flutter app for practicing unlocked WaniKani kanji with three quiz modes.
 version: 0.1.0+1
 environment:
-  sdk: ^3.9.2
+  sdk: '>=3.3.0 <4.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
-  shared_preferences: ^2.0.15
-  sqflite: ^2.2.8+4
-  sqflite_common_ffi: ^2.3.0
-  path_provider: ^2.0.14
-  path: ^1.8.3
-  provider: ^6.0.5
+  shared_preferences: ^2.5.3
+  sqflite: ^2.4.2
+  path_provider: ^2.1.5
+  path: ^1.9.1
+  provider: ^6.1.5+1
   http: ^1.5.0
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  mockito: ^5.4.0
-  test: ^1.24.0
-  flutter_launcher_icons: ^0.11.0
+  mockito: ^5.5.0
+  test: ^1.26.2
+  flutter_launcher_icons: ^0.14.4
+  flutter_lints: ^6.0.0
 
 flutter_icons:
   android: true