add 'Onur Özkan' to .mailmap

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

.mailmap

@@ -445,6 +445,8 @@ Oliver Scherer <oli-obk@users.noreply.github.com> <public.oliver.schneider@kit.e
 Oliver Scherer <oli-obk@users.noreply.github.com> <oliver.schneider@kit.edu>
 Oliver Scherer <oli-obk@users.noreply.github.com> <obk8176014uqher834@olio-obk.de>
 Oliver Scherer <oli-obk@users.noreply.github.com>
+Onur Özkan <onurozkan.dev@outlook.com> <work@onurozkan.dev>
+Onur Özkan <onurozkan.dev@outlook.com>
 Ömer Sinan Ağacan <omeragacan@gmail.com>
 Ophir LOJKINE <pere.jobs@gmail.com>
 Ožbolt Menegatti <ozbolt.menegatti@gmail.com> gareins <ozbolt.menegatti@gmail.com>