Issue #18200: Update the stdlib (except tests) to use
ModuleNotFoundError.
diff --git a/Lib/http/cookiejar.py b/Lib/http/cookiejar.py
index be828eb..fd40ee0 100644
--- a/Lib/http/cookiejar.py
+++ b/Lib/http/cookiejar.py
@@ -35,7 +35,7 @@
 import urllib.parse, urllib.request
 try:
     import threading as _threading
-except ImportError:
+except ModuleNotFoundError:
     import dummy_threading as _threading
 import http.client  # only for the default HTTP port
 from calendar import timegm