dockerfiles: Remove 'MAINTAINER' entry in debian-tricore-cross.docker

dockerfiles: Remove 'MAINTAINER' entry in debian-tricore-cross.docker

AMSAT closed its email service [*] so my personal email
address is now defunct. Remove it to avoid bouncing emails.

[*] https://web.archive.org/web/20240617194936/https://forum.amsat-dl.org/index.php?thread/4581-amsat-mail-alias-service-to-end-august-1-2024/

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20250102152513.61065-1-philmd@linaro.org>
[AJB: update URL to web.archive.org]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250108121054.1126164-32-alex.bennee@linaro.org>