support/testing: TestSELinuxSystemd: kernel bump 6.1.26

We are going to update the toolchain used by the Buildroot testsuite
and this update will break the kernel build with the Bootlin stable
toolchain due to an latent issue.

Fixes:
arch/x86/entry/thunk_64.o: warning: objtool: missing symbol table
make[4]: *** [scripts/Makefile.build:361: arch/x86/entry/thunk_64.o] Error 1
make[4]: *** Deleting file 'arch/x86/entry/thunk_64.o'
make[4]: *** Waiting for unfinished jobs....

[fixed since kernel 6.0]
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=de979c83574abf6e78f3fa65b716515c91b2613d

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/init/test_systemd_selinux.py

@@ -12,7 +12,7 @@ class TestSELinuxSystemd(infra.basetest.BRTest):
         BR2_INIT_SYSTEMD=y
         BR2_LINUX_KERNEL=y
         BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.8.12"
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.1.26"
         BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
         BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86_64/linux.config"
         BR2_PACKAGE_LIBSELINUX=y