Add csv.__version__ (#7357)

stdlib/_csv.pyi

@@ -1,6 +1,8 @@
 from typing import Any, Iterable, Iterator, Protocol, Union
 from typing_extensions import Literal
 
+__version__: str
+
 QUOTE_ALL: Literal[1]
 QUOTE_MINIMAL: Literal[0]
 QUOTE_NONE: Literal[3]

stdlib/csv.pyi

@@ -6,6 +6,7 @@ from _csv import (
     QUOTE_NONNUMERIC as QUOTE_NONNUMERIC,
     Dialect as Dialect,
     Error as Error,
+    __version__ as __version__,
     _DialectLike,
     _reader,
     _writer,