Update kernel-source to version 5.13.1 / rev 595 via SR 905770
https://build.opensuse.org/request/show/905770
by user jirislaby + dimstar_suse
5.13.1 (nested kvm fix only) & config changes (RISC 5, FIPS, ...) & NO (reverted) UsrMerge for kernel (/boot -> /usr move)