chore: Update dependencies and submodules (#1052)

- Update the fl_lib submodule to the latest commit
- Remove dependency comments using submodules from pubspec.yaml
- Upgrade local_auth and related platform implementations to new versions

pubspec.yaml

@@ -65,12 +65,6 @@ dependencies:
 dependency_overrides:
   # webdav_client_plus:
   #   path: ../webdav_client
-  # dartssh2:
-  #   path: ../dartssh2
-  # xterm:
-  #   path: ../xterm.dart
-  # fl_lib:
-  #   path: ../fl_lib
   # fl_build:
   #   path: ../fl_build
   gtk: # TODO: remove it after fixed in upstream