joker: 0.8.7 -> 0.8.9

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/16sl6aacbf5yg39jy7k5851ixs26hsnh-joker-0.8.9-bin/bin/joker -h` got 0 exit code
- ran `/nix/store/16sl6aacbf5yg39jy7k5851ixs26hsnh-joker-0.8.9-bin/bin/joker --help` got 0 exit code
- ran `/nix/store/16sl6aacbf5yg39jy7k5851ixs26hsnh-joker-0.8.9-bin/bin/joker help` got 0 exit code
- ran `/nix/store/16sl6aacbf5yg39jy7k5851ixs26hsnh-joker-0.8.9-bin/bin/joker -v` and found version 0.8.9
- ran `/nix/store/16sl6aacbf5yg39jy7k5851ixs26hsnh-joker-0.8.9-bin/bin/joker --version` and found version 0.8.9
- found 0.8.9 with grep in /nix/store/16sl6aacbf5yg39jy7k5851ixs26hsnh-joker-0.8.9-bin
- found 0.8.9 in filename of file in /nix/store/16sl6aacbf5yg39jy7k5851ixs26hsnh-joker-0.8.9-bin

cc "@andrestylianos @ehmry @lethalman"