hiawatha: 10.5 -> 10.7

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/ssi-cgi -h` got 0 exit code
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/ssi-cgi -v` and found version 10.7
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/ssi-cgi -h` and found version 10.7
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/hiawatha -h` got 0 exit code
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/hiawatha -v` and found version 10.7
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/hiawatha -h` and found version 10.7
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/wigwam -h` got 0 exit code
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/wigwam -v` and found version 10.7
- ran `/nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7/bin/wigwam -h` and found version 10.7
- found 10.7 with grep in /nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7
- found 10.7 in filename of file in /nix/store/5x2w4d0fm3m3wr5snf6c7qys9g2kia3h-hiawatha-10.7

cc "@ndowens"