Issue #15424: Add a __sizeof__ implementation for array objects.

Patch by Ludwig Hähne.
diff --git a/Misc/ACKS b/Misc/ACKS
index 56d5765..1f098d4 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -393,6 +393,7 @@
 Greg Humphreys
 Eric Huss
 Jeremy Hylton
+Ludwig Hähne
 Gerhard Häring
 Fredrik Håård
 Catalin Iacob