build: (deps): bump matrix from 4.1.0 to 5.0.0

Bumps [matrix](https://github.com/famedly/matrix-dart-sdk) from 4.1.0 to 5.0.0.
- [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/v4.1.0...v5.0.0)

---
updated-dependencies:
- dependency-name: matrix
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pubspec.lock

@@ -1088,10 +1088,10 @@ packages:
     dependency: "direct main"
     description:
       name: matrix
-      sha256: fb116ee89f6871441f22f76a988db15cfcfb6dfac97e3e2d654c240080015707
+      sha256: "8cf9f502bf67e996b0503c8597c3b789c955f8b2331ecd4433658c732dc2c13f"
       url: "https://pub.dev"
     source: hosted
-    version: "4.1.0"
+    version: "5.0.0"
   meta:
     dependency: transitive
     description: