Close #19406: Initial implementation of ensurepip

Patch by Donald Stufft and Nick Coghlan
diff --git a/Misc/ACKS b/Misc/ACKS
index 5038eeb..34fac02 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1244,6 +1244,7 @@
 Serhiy Storchaka
 Ken Stox
 Dan Stromberg
+Donald Stufft
 Daniel Stutzbach
 Andreas Stührk
 Colin Su