mcelog: 154 -> 156

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. These checks were done:

- built on NixOS
- ran `/nix/store/3zc741ihwv728148wk2m7a61hj9rrp5c-mcelog-156/bin/mcelog --help` got 0 exit code
- ran `/nix/store/3zc741ihwv728148wk2m7a61hj9rrp5c-mcelog-156/bin/mcelog --version` and found version 156
- ran `/nix/store/3zc741ihwv728148wk2m7a61hj9rrp5c-mcelog-156/bin/mcelog --help` and found version 156
- found 156 with grep in /nix/store/3zc741ihwv728148wk2m7a61hj9rrp5c-mcelog-156
- found 156 in filename of file in /nix/store/3zc741ihwv728148wk2m7a61hj9rrp5c-mcelog-156