Use _extract_single_node in brain_re (#1359)

Author: DanielNoord

astroid/brain/brain_re.py

@@ -4,7 +4,7 @@
 
 from astroid import context, inference_tip, nodes
 from astroid.brain.helpers import register_module_extender
-from astroid.builder import extract_node, parse
+from astroid.builder import _extract_single_node, parse
 from astroid.const import PY37_PLUS, PY39_PLUS
 from astroid.manager import AstroidManager
 
@@ -77,7 +77,7 @@ def infer_pattern_match(
         parent=node.parent,
     )
     if PY39_PLUS:
-        func_to_add = extract_node(CLASS_GETITEM_TEMPLATE)
+        func_to_add = _extract_single_node(CLASS_GETITEM_TEMPLATE)
         class_def.locals["__class_getitem__"] = [func_to_add]
     return iter([class_def])