Since Buildroot commit [1] "update to Bootlin toolchains 2025.08-1", the tests.init.test_systemd_selinux fails when building its Kernel 6.1.26 with gcc 15.1.0. This commit fixes the issue by updating the test Kernel to the latest 6.1.y version (6.1.148 at the time of this commit) which includes several fixes for gcc-15 like this one [2]. Fixes: https://gitlab.com/buildroot.org/buildroot/-/jobs/10984685949 https://gitlab.com/buildroot.org/buildroot/-/jobs/10984685950 [1]947dbc92a2[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0f82f6f1556389d6489795f03ac3f68cde99d5ad Signed-off-by: Julien Olivain <ju.o@free.fr> [Romain: Add a link to one of the kernel commit related to gcc-15] Signed-off-by: Romain Naour <romain.naour@smile.fr> (cherry picked from commit8d6f9393ec) Signed-off-by: Thomas Perale <thomas.perale@mind.be>