remove unused code

Author: d-biehl

robotcode/language_server/common/text_document.py

@@ -39,7 +39,6 @@ def __init__(
         super().__init__()
 
         self._lock = Lock()
-        self._references: weakref.WeakSet[Any] = weakref.WeakSet()
         self.document_uri = document_uri
         self.uri = Uri(self.document_uri).normalized()
         self.language_id = language_id
@@ -52,10 +51,6 @@ def __init__(
         self._data: weakref.WeakKeyDictionary[Any, Any] = weakref.WeakKeyDictionary()
         self.opened_in_editor = False
 
-    @property
-    def references(self) -> weakref.WeakSet[Any]:  # pragma: no cover
-        return self._references
-
     @property
     def version(self) -> Optional[int]:
         return self._version