feat: Check markdown checkboxes in messages

pubspec.yaml

@@ -61,7 +61,10 @@ dependencies:
   just_audio: ^0.9.39
   latlong2: ^0.9.1
   linkify: ^5.0.0
-  matrix: ^0.40.0
+  matrix:
+    git:
+      url: https://github.com/famedly/matrix-dart-sdk.git
+      ref: krille/add-markdown-checkboxes
   mime: ^1.0.6
   native_imaging: ^0.2.0
   opus_caf_converter_dart: ^1.0.1
@@ -140,4 +143,4 @@ dependency_overrides:
       url: https://github.com/ThexXTURBOXx/flutter_web_auth_2.git
       ref: 3.x-without-v1
       path: flutter_web_auth_2
-  win32: 5.5.3
+  win32: 5.5.3