sxhkd: 0.5.8 -> 0.5.9

Semi-automatic update generated by https://github.com/ryantm/nix-update tools.

This update was made based on information from https://repology.org/metapackage/sxhkd/versions.

These checks were done:

- built on NixOS
- ran `/nix/store/psgpqlc79whix5834kvvs9klgiyinl72-sxhkd-0.5.9/bin/sxhkd -h` got 0 exit code
- ran `/nix/store/psgpqlc79whix5834kvvs9klgiyinl72-sxhkd-0.5.9/bin/sxhkd --help` got 0 exit code
- ran `/nix/store/psgpqlc79whix5834kvvs9klgiyinl72-sxhkd-0.5.9/bin/sxhkd -v` and found version 0.5.9
- ran `/nix/store/psgpqlc79whix5834kvvs9klgiyinl72-sxhkd-0.5.9/bin/sxhkd --version` and found version 0.5.9
- ran `/nix/store/psgpqlc79whix5834kvvs9klgiyinl72-sxhkd-0.5.9/bin/sxhkd --help` and found version 0.5.9
- found 0.5.9 with grep in /nix/store/psgpqlc79whix5834kvvs9klgiyinl72-sxhkd-0.5.9
- directory tree listing: https://gist.github.com/7b7f60bf79af2063b4100fb74b4c468c