mailmap: Update Luca Weiss's email address

I'm slowly migrating my mail to a new domain, add an entry to map the
mail address. Just for clarity, my work-related @fairphone.com email
stays unchanged.

Signed-off-by: Luca Weiss <luca@lucaweiss.eu>
Link: https://lore.kernel.org/r/20240628-mailmap-v1-1-a0d12ffd1cd9@lucaweiss.eu
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: z3ntu

.mailmap

@@ -381,6 +381,7 @@ Li Yang <leoyang.li@nxp.com> <leo@zh-kernel.org>
 Lior David <quic_liord@quicinc.com> <liord@codeaurora.org>
 Lorenzo Pieralisi <lpieralisi@kernel.org> <lorenzo.pieralisi@arm.com>
 Luca Ceresoli <luca.ceresoli@bootlin.com> <luca@lucaceresoli.net>
+Luca Weiss <luca@lucaweiss.eu> <luca@z3ntu.xyz>
 Lukasz Luba <lukasz.luba@arm.com> <l.luba@partner.samsung.com>
 Luo Jie <quic_luoj@quicinc.com> <luoj@codeaurora.org>
 Maciej W. Rozycki <macro@mips.com> <macro@imgtec.com>