Update CREDITS to correct my name (#18710)

Author: emmatyping

CREDITS

@@ -15,7 +15,7 @@ Dropbox core team:
 
 Non-Dropbox core team members:
 
-  Ethan Smith
+  Emma Harper Smith <emma@python.org>
   Guido van Rossum <guido@python.org>
   Jelle Zijlstra <jelle.zijlstra@gmail.com>
   Michael J. Sullivan <sully@msully.net>