[WebOb] Add cgi_FieldStorage.make_file on Python 3.13+ (#13654)

Author: srittau

stubs/WebOb/webob/compat.pyi

@@ -1,5 +1,6 @@
 import sys
 from html import escape as escape
+from io import FileIO, TextIOWrapper
 from queue import Empty as Empty, Queue as Queue
 from typing import IO
 
@@ -8,6 +9,7 @@ if sys.version_info >= (3, 13):
     class cgi_FieldStorage:
         filename: str
         file: IO[bytes]
+        def make_file(self) -> TextIOWrapper | FileIO: ...
 
     def parse_header(line: str) -> tuple[str, dict[str, str]]: ...