build: add Alan to the mailmap file

He uses many addresses and some of his computers are not configured
properly :P

Author: hansl

.mailmap

@@ -16,6 +16,8 @@ Charles Lyding <clydin@users.noreply.github.com>
     Charles Lyding <clydin@users.noreply.github.com> <19598772+clydin@users.noreply.github.com>
 Filipe Silva <filipematossilva@gmail.com>
 Mike Brocchi <mbrocchi@gmail.com>
+Alan Agius <alan.agius4@users.noreply.github.com>
+    Alan Agius <alan.agius4@users.noreply.github.com> <alan.agius4@gmail.com> <alan.agius@betssongroup.com>
 
 
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