Issue #18962:  Optimize the single iterator case for  heapq.merge()

Suggested by Wouter Bolsterlee.
diff --git a/Misc/ACKS b/Misc/ACKS
index 030f980..9d0dc46 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -135,6 +135,7 @@
 Matthew Boedicker
 Robin Boerdijk
 David Bolen
+Wouter Bolsterlee
 Gawain Bolton
 Forest Bond
 Gregory Bond