[3.7] bpo-29673: fix gdb scripts pystack and pystackv (GH-6126) (GH-6399)

(cherry picked from commit 3a9ccee0e5dbf7d67f5ab79f6095755969db117c)

Co-authored-by: Marcel Plch <gmarcel.plch@gmail.com>
diff --git a/Misc/ACKS b/Misc/ACKS
index c70f62e..554307a 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1248,6 +1248,7 @@
 Antoine Pitrou
 Jean-François Piéronne
 Oleg Plakhotnyuk
+Marcel Plch
 Remi Pointel
 Jon Poler
 Ariel Poliak