bpo-31294: Fix ZeroMQSocketListener and ZeroMQSocketHandler examples (#3229)

* Fix ZeroMQSocketListener and ZeroMQSocketHandler examples

* Use send_json and recv_json to simplify pyzmq interfacing

* Add News entry
diff --git a/Misc/ACKS b/Misc/ACKS
index eadc5d3..462a74e 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1561,6 +1561,7 @@
 Gustavo Temple
 Mikhail Terekhov
 Victor Terrón
+Pablo Galindo
 Richard M. Tew
 Tobias Thelen
 Christian Theune