rtv: 1.21.0 -> 1.22.1

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

- built on NixOS
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/.rtv-wrapped -h` got 0 exit code
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/.rtv-wrapped --help` got 0 exit code
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/.rtv-wrapped -V` and found version 1.22.1
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/.rtv-wrapped --version` and found version 1.22.1
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/rtv -h` got 0 exit code
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/rtv --help` got 0 exit code
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/rtv -V` and found version 1.22.1
- ran `/nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1/bin/rtv --version` and found version 1.22.1
- found 1.22.1 with grep in /nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1
- found 1.22.1 in filename of file in /nix/store/mpyc1z74lsma9vfc4b04glvvyfs0l40j-rtv-1.22.1