From bb6c85609a9aab4f9bb512934bb20eaa83782743 Mon Sep 17 00:00:00 2001
From: Harshil <37377066+harshil21@users.noreply.github.com>
Date: Sat, 24 Feb 2024 06:31:50 -0500
Subject: [PATCH] Add Missing Slot to `Updater` (#4130)

---
 telegram/ext/_updater.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/telegram/ext/_updater.py b/telegram/ext/_updater.py
index 24f2bc045..70fb650a2 100644
--- a/telegram/ext/_updater.py
+++ b/telegram/ext/_updater.py
@@ -102,6 +102,7 @@ class Updater(AsyncContextManager["Updater"]):
 
     __slots__ = (
         "__lock",
+        "__polling_cleanup_cb",
         "__polling_task",
         "_httpd",
         "_initialized",