Updated to embedding v2

Ref: https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects

Fixes for sentry reporting

Ref: https://github.com/flutter/flutter/issues/48972

pubspec.lock

@@ -421,12 +421,19 @@ packages:
     source: hosted
     version: "2.4.9"
   sentry:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: sentry
       url: "https://pub.dartlang.org"
     source: hosted
     version: "4.0.4"
+  sentry_flutter:
+    dependency: "direct main"
+    description:
+      name: sentry_flutter
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.4"
   shared_preferences:
     dependency: "direct main"
     description: