Clean up unused code in Language (#12836)

Follow-up to #12701.

spacy/language.py

@@ -1825,7 +1825,6 @@ class Language:
         # Later we replace the component config with the raw config again.
         interpolated = filled.interpolate() if not filled.is_interpolated else filled
         pipeline = interpolated.get("components", {})
-        sourced = util.get_sourced_components(interpolated)
         # If components are loaded from a source (existing models), we cache
         # them here so they're only loaded once
         source_nlps = {}