mailmap: update entry for Jan Kuliga

Soon I won't be able to use my current email address.

Link: https://lkml.kernel.org/r/20240830095658.1203198-1-jankul@alatek.krakow.pl


Signed-off-by: Jan Kuliga <jankul@alatek.krakow.pl>
Cc: David S. Miller <davem@davemloft.net>
Cc: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>