build: (deps): bump matrix from 6.1.0 to 6.1.1

Bumps [matrix](https://github.com/famedly/matrix-dart-sdk) from 6.1.0 to 6.1.1.
- [Release notes](https://github.com/famedly/matrix-dart-sdk/releases)
- [Changelog](https://github.com/famedly/matrix-dart-sdk/blob/main/CHANGELOG.md)
- [Commits](https://github.com/famedly/matrix-dart-sdk/compare/v6.1.0...v6.1.1)

---
updated-dependencies:
- dependency-name: matrix
  dependency-version: 6.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pubspec.yaml

@@ -53,7 +53,7 @@ dependencies:
   just_audio: ^0.10.5
   latlong2: ^0.9.1
   linkify: ^5.0.0
-  matrix: ^6.1.0
+  matrix: ^6.1.1
   mime: ^2.0.0
   opus_caf_converter_dart: ^1.0.1
   package_info_plus: ^9.0.0