meta: add mailmap entry for branisha

Add mailmap entry to consolidate duplicate entries in AUTHORS file.

PR-URL: #39889
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

.mailmap

@@ -300,6 +300,7 @@ Nebu Pookins <nebu@nebupookins.net>
 Netto Farah <nettofarah@gmail.com>
 Nicholas Kinsey <pyrotechnick@feistystudios.com>
 Nick Soggin <nicksoggin@gmail.com> <iSkore@users.noreply.github.com>
+Nikola Glavina <glavina.nikola5@gmail.com> <nikola.glavina@student.um.si>
 Nikolai Vavilov <vvnicholas@gmail.com>
 Nils Kuhnhenn <lain@volafile.io>
 Nitzan Uziely <linkgoron@gmail.com> <nitzan@testim.io>

AUTHORS

@@ -3088,7 +3088,7 @@ Anentropic <ego@anentropic.com>
 Saleem <hamids2@asme.org>
 Julien Poissonnier <julien@caffeine.lu>
 zombieleet <zombieleetnca@gmail.com>
-Nikola Glavina <nikola.glavina@student.um.si>
+Nikola Glavina <glavina.nikola5@gmail.com>
 Johannes Schöpp <schoepp@rz.uni-frankfurt.de>
 Francisco Ryan Tolmasky I <tolmasky@gmail.com>
 Ye-hyoung Kang <keepyourhonor@gmail.com>
@@ -3167,7 +3167,6 @@ FeelyChau <feely@outlook.com>
 Darcy Clarke <darcy@darcyclarke.me>
 mayank agarwal <mayankagarwal44442@gmail.com>
 woodfairy <d.schmit@m3connect.de>
-Nikola Glavina <glavina.nikola5@gmail.com>
 Rishabh Mehan <darkrishabh@gmail.com>
 Andrew Casey <andrew.casey@microsoft.com>
 Anders Kaseorg <andersk@mit.edu>