Issue #22191: Fix warnings.__all__.

Thanks to Jon Poler for the patch.
diff --git a/Misc/ACKS b/Misc/ACKS
index b16dd70..4986dc6 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1054,6 +1054,7 @@
 Jean-François Piéronne
 Oleg Plakhotnyuk
 Remi Pointel
+Jon Poler
 Ariel Poliak
 Guilherme Polo
 Illia Polosukhin