meta: align email address in README/.mailmap/AUTHORS

Modify .mailmap so Myles has the same email address in AUTHORS as he
does in README.

PR-URL: #39503
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

.mailmap

@@ -288,9 +288,9 @@ Minwoo Jung <nodecorelab@gmail.com> <jmwsoft@gmail.com>
 Minwoo Jung <nodecorelab@gmail.com> <minwoo@nodesource.com>
 Miroslav Bajtoš <miroslav@strongloop.com> <miro.bajtos@gmail.com>
 Mitar Milutinovic <mitar.git@tnode.com>
-Myles Borins <mylesborins@github.com> <mborins@us.ibm.com>
-Myles Borins <mylesborins@github.com> <myles.borins@gmail.com>
-Myles Borins <mylesborins@github.com> <mylesborins@google.com>
+Myles Borins <myles.borins@gmail.com> <mborins@us.ibm.com>
+Myles Borins <myles.borins@gmail.com> <mylesborins@github.com>
+Myles Borins <myles.borins@gmail.com> <mylesborins@google.com>
 Nam Nguyen <nam.nguyen@de.ibm.com>
 Nebu Pookins <nebu@nebupookins.net>
 Netto Farah <nettofarah@gmail.com>

AUTHORS

@@ -808,7 +808,7 @@ David Boivin <dave.a.boivin@gmail.com>
 Liang-Chi Hsieh <viirya@appier.com>
 Timothy Gu <timothygu99@gmail.com>
 Fábio Santos <fabiosantosart@gmail.com>
-Myles Borins <mylesborins@github.com>
+Myles Borins <myles.borins@gmail.com>
 Jonas Dohse <jonas@dohse.ch>
 Коренберг Марк <mark@ideco.ru>
 Caleb Boyd <caleb.boyd@gmail.com>