check_new_syntax.py: check nested annotations (#6167)

stubs/dateparser/dateparser/utils/__init__.pyi

@@ -1,11 +1,11 @@
 from collections import OrderedDict
-from typing import Any, List, Mapping
+from typing import Any, Mapping
 
 def strip_braces(date_string: str) -> str: ...
 def normalize_unicode(string: str, form: str = ...) -> str: ...
 def combine_dicts(
     primary_dict: Mapping[Any, Any], supplementary_dict: Mapping[Any, Any]
-) -> OrderedDict[str, str | List[Any]]: ...
+) -> OrderedDict[str, str | list[Any]]: ...
 def find_date_separator(format) -> Any: ...
 def localize_timezone(date_time, tz_string): ...
 def apply_tzdatabase_timezone(date_time, pytz_string): ...