.mailmap: add an alias for Axel Davy

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index c1a40cf..3b094ca 100644
--- a/.mailmap
+++ b/.mailmap
@@ -60,6 +60,8 @@
 
 Arthur Huillet <arthur.huillet@free.fr> Arthur HUILLET <arthur.huillet@free.fr>
 
+Axel Davy <axel.davy@ens.fr> <davyaxel0@gmail.com>
+
 Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> <basni@chromium.org>
 
 Benjamin Franzke <benjaminfranzke@googlemail.com> ben <benjaminfranzke@googlemail.com>