refactor: Switch to pub.dev version of matrix sdk

pubspec.lock

@@ -218,15 +218,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
-  famedlysdk:
-    dependency: "direct main"
-    description:
-      path: "."
-      ref: main
-      resolved-ref: "38d81d60933b46085ad5458b0fad6e62eaf92815"
-      url: "https://gitlab.com/famedly/famedlysdk.git"
-    source: git
-    version: "0.1.0"
   fcm_shared_isolate:
     dependency: "direct main"
     description:
@@ -592,6 +583,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.12.10"
+  matrix:
+    dependency: "direct main"
+    description:
+      name: matrix
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.1"
   matrix_api_lite:
     dependency: transitive
     description: