Social profile source is now in the Drupal namespace

Classes in the Open Social installation profile src/ directory were put in the \Social namespace. This breaks Drupal conventions and causes issues when moving more code here that relies on Drupal's automatic class resolution.

The namespacing rule has been removed and we're now relying on the default namespacing behaviour which moves the classes under the \Drupal\social namespace. This will allow us to place more shared code here in the future.

This should not cause any issues for you unless you were accessing the AssetPackagist or SocialTest class directly.