.mailmap: add an alias for Iago Toral Quiroga

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4739>
diff --git a/.mailmap b/.mailmap
index b844054..3449876 100644
--- a/.mailmap
+++ b/.mailmap
@@ -247,6 +247,8 @@
 
 Hui Qi Tay <hqtay@vmware.com> <tayhuiqithq@gmail.com>
 
+Iago Toral Quiroga <itoral@igalia.com> Iago Toral <itoral@igalia.com>
+
 Ian Romanick <ian.d.romanick@intel.com> <idr@freedesktop.org>
 Ian Romanick <ian.d.romanick@intel.com> <idr@us.ibm.com>