fwts: 18.03.00 -> 18.05.00 (#41563)

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

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

These checks were done:

- built on NixOS
- /nix/store/v5wy7231jv43gnni4s3jcq0lz1qx21bs-fwts-18.05.00/bin/fwts passed the binary check.
- Warning: no invocation of /nix/store/v5wy7231jv43gnni4s3jcq0lz1qx21bs-fwts-18.05.00/bin/kernelscan had a zero exit code or showed the expected version
- 1 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 18.05.00 with grep in /nix/store/v5wy7231jv43gnni4s3jcq0lz1qx21bs-fwts-18.05.00
- directory tree listing: https://gist.github.com/8fb4995cd885cdeea7a35d51b7edca3b
- du listing: https://gist.github.com/8cc61b948b8e0aa4a1a8088464c5536d