Update RustyYato's email

I no longer use the old email address

Author: RustyYato

.mailmap

@@ -596,7 +596,7 @@ Rui <xiongmao86dev@sina.com>
 Russell Johnston <rpjohnst@gmail.com>
 Rustin-Liu <rustin.liu@gmail.com>
 Rusty Blitzerr <rusty.blitzerr@gmail.com>
-RustyYato <krishna.sd.2012@gmail.com>
+RustyYato <rustyyato@gmail.com>
 Ruud van Asseldonk <dev@veniogames.com> Ruud van Asseldonk <ruuda@google.com>
 Ryan Leung <rleungx@gmail.com>
 Ryan Levick <me@ryanlevick.com> <rylev@users.noreply.github.com>