provider: fix vcs source/resolved ref propagation

This change ensures that when complete packages are created dependency
inherits source and resolved refs from package.

poetry/puzzle/provider.py

@@ -184,6 +184,9 @@ class Provider:
         dependency._constraint = package.version
         dependency._pretty_constraint = package.version.text
 
+        dependency._source_reference = package.source_reference
+        dependency._source_resolved_reference = package.source_resolved_reference
+
         self._deferred_cache[dependency] = package
 
         return [package]