openfortivpn: 1.7.0 -> 1.7.1

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

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

These checks were done:

- built on NixOS
- /nix/store/qn1hzzhcv20cyk6q58wlgjar03dbqbqv-openfortivpn-1.7.1/bin/openfortivpn passed the binary check.
- 1 of 1 passed binary check by having a zero exit code.
- 1 of 1 passed binary check by having the new version present in output.
- found 1.7.1 with grep in /nix/store/qn1hzzhcv20cyk6q58wlgjar03dbqbqv-openfortivpn-1.7.1
- directory tree listing: https://gist.github.com/8d202ae1f27f632d9f02045900200b02
- du listing: https://gist.github.com/809d7d83e583187909b98ed31fae9fab