mailmap: add entry for Alexander Mikhalitsyn

My old email <alexander.mikhalitsyn@virtuozzo.com> isn't working
anymore.

Link: https://lkml.kernel.org/r/20230131123456.192657-1-aleksandr.mikhalitsyn@canonical.com
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>