criu: 3.7 -> 3.8

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

- built on NixOS
- ran `/nix/store/rhcppqwmdlwak4ifncamjiqqybwlhvcj-criu-3.8/bin/compel -h` got 0 exit code
- ran `/nix/store/rhcppqwmdlwak4ifncamjiqqybwlhvcj-criu-3.8/bin/compel --help` got 0 exit code
- ran `/nix/store/rhcppqwmdlwak4ifncamjiqqybwlhvcj-criu-3.8/bin/criu -h` got 0 exit code
- ran `/nix/store/rhcppqwmdlwak4ifncamjiqqybwlhvcj-criu-3.8/bin/criu --help` got 0 exit code
- ran `/nix/store/rhcppqwmdlwak4ifncamjiqqybwlhvcj-criu-3.8/bin/criu -V` and found version 3.8
- ran `/nix/store/rhcppqwmdlwak4ifncamjiqqybwlhvcj-criu-3.8/bin/criu --version` and found version 3.8
- found 3.8 with grep in /nix/store/rhcppqwmdlwak4ifncamjiqqybwlhvcj-criu-3.8
- directory tree listing: https://gist.github.com/6bc3ef9b1f4c69a6862043a1158fba16