refactor: Migrate to newer keyboard shortcuts package

pubspec.yaml

@@ -62,12 +62,12 @@ dependencies:
   image_picker: ^1.1.0
   intl: any
   just_audio: ^0.9.39
-  keyboard_shortcuts: ^0.1.4
   latlong2: ^0.9.1
   linkify: ^5.0.0
   matrix: ^0.34.0
   mime: ^1.0.6
   native_imaging: ^0.1.1
+  new_keyboard_shortcuts: ^0.1.4
   opus_caf_converter_dart: ^1.0.1
   package_info_plus: ^8.0.2
   pasteboard: ^0.2.0
@@ -153,10 +153,4 @@ msix_config:
   install_certificate: false
 
 dependency_overrides:
-  # waiting for null safety
-  # Upstream pull request: https://github.com/AntoineMarcel/keyboard_shortcuts/pull/13
-  keyboard_shortcuts:
-    git:
-      url: https://github.com/TheOneWithTheBraid/keyboard_shortcuts.git
-      ref: null-safety
   win32: 5.5.3