gpsprune: 18.6 -> 19

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

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

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/akzrr13fzbw4ympkxcjp4v434hbfw6nb-gpsprune-19/bin/gpsprune had a zero exit code or showed the expected version
- 0 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 19 with grep in /nix/store/akzrr13fzbw4ympkxcjp4v434hbfw6nb-gpsprune-19
- directory tree listing: https://gist.github.com/093deda67a3697cfb7ceb5e487494b74
- du listing: https://gist.github.com/c4d02de001bcd6a66916da90695ae515