Semi-automatic update. These checks were performed:
- built on NixOS
- ran `/nix/store/p13fvkr38qrak3ng6lpmj4z1palhr2in-cryptoverif-1.28/bin/cryptoverif --help` got 0 exit code
- found 1.28 with grep in /nix/store/p13fvkr38qrak3ng6lpmj4z1palhr2in-cryptoverif-1.28
- found 1.28 in filename of file in /nix/store/p13fvkr38qrak3ng6lpmj4z1palhr2in-cryptoverif-1.28