[2.7] bpo-33542: Ignore DUID in uuid.get_node on Windows. (GH-6922) (GH-7015)

uuid._ipconfig_getnode did not validate the maximum length of the value,
so long as the value had the same type of formatting as a MAC address.
This let it select DUIDs as MAC addresses. It now requires an exact
length match..
(cherry picked from commit c66c342cb42ab8a88884527ddfe3a5086bc06316)

Co-authored-by: CtrlZvi <viz+github@flippedperspective.com>
diff --git a/Misc/ACKS b/Misc/ACKS
index 394fbb9..295b933 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -381,6 +381,7 @@
 David Edelsohn
 John Edmonds
 Grant Edwards
+Zvi Effron
 John Ehresman
 Tal Einat
 Eric Eisner