Build failure on nixpkgs

[khionu]

Currently, it appears that there's some codegen issues happening with 0.2.21 on NixOS. I bumped libcryptsetup-rs to use 0.9 locally, as well as ran cargo update, and that seems to have corrected the issue. If a patch version could be released with those changes, that should unblock things upstream.

Ref: NixOS/nixpkgs#288865

[shimunn]

Please use the current 0.3.1-alpha version, as I cannot keep maintaining old versions. 0.3 contains some breaking changes in the cli interface, therefore the luksroot.nix module will need to be tweaked.