build: Use matrix sdk vom pub.dev again

pubspec.lock

@@ -1087,12 +1087,11 @@ packages:
   matrix:
     dependency: "direct main"
     description:
-      path: "."
-      ref: HEAD
-      resolved-ref: "9bf0a7fe207deb483ccb99c939a001fa9999036c"
-      url: "https://github.com/famedly/matrix-dart-sdk.git"
-    source: git
-    version: "4.0.1"
+      name: matrix
+      sha256: fb116ee89f6871441f22f76a988db15cfcfb6dfac97e3e2d654c240080015707
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.0"
   meta:
     dependency: transitive
     description:

pubspec.yaml

@@ -53,8 +53,7 @@ dependencies:
   just_audio: ^0.10.5
   latlong2: ^0.9.1
   linkify: ^5.0.0
-  matrix: #^4.0.1
-    git: https://github.com/famedly/matrix-dart-sdk.git
+  matrix: ^4.1.0
   mime: ^2.0.0
   native_imaging: ^0.2.0
   opus_caf_converter_dart: ^1.0.1