Issue #21116: Avoid blowing memory when allocating a multiprocessing shared
array that's larger than 50% of the available RAM.

Patch by Médéric Boquien.
diff --git a/Misc/ACKS b/Misc/ACKS
index 9a3de4e..d1074bd 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -154,6 +154,7 @@
 Gawain Bolton
 Forest Bond
 Gregory Bond
+Médéric Boquien
 Matias Bordese
 Jonas Borgström
 Jurjen Bos