cni: 0.5.2 -> 0.6.0

Semi-automatic update. These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 0.6.0 with grep in /nix/store/20rzgnqnxfx21j49wr48pd4p9wb0ai5z-cni-0.6.0
- found 0.6.0 in filename of file in /nix/store/20rzgnqnxfx21j49wr48pd4p9wb0ai5z-cni-0.6.0