libinfinity: 0.6.5 -> 0.7.1

Semi-automatic update. These checks were performed:

- built on NixOS
- found 0.7.1 with grep in /nix/store/bl4k9m05mbhzwm8r2z6x2aqnqd2gdml0-libinfinity-0.7.1
- found 0.7.1 in filename of file in /nix/store/bl4k9m05mbhzwm8r2z6x2aqnqd2gdml0-libinfinity-0.7.1

cc "@phreedom"