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.lock

@@ -1088,10 +1088,10 @@ packages:
     dependency: "direct main"
     description:
       name: matrix
-      sha256: f5befb7a9e9658b0b0901cdda86407a909319712a30984ed177f7317ce5f24f1
+      sha256: c0214ee99a73957d3c02d54a60afcf9acee577b0924749085d6fdf556e8eba42
       url: "https://pub.dev"
     source: hosted
-    version: "6.1.0"
+    version: "6.1.1"
   meta:
     dependency: transitive
     description: