gitless: 0.8.5 -> 0.8.6

Semi-automatic update. These checks were done:

- built on NixOS
- ran `/nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6/bin/.gl-wrapped -h` got 0 exit code
- ran `/nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6/bin/.gl-wrapped --help` got 0 exit code
- ran `/nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6/bin/.gl-wrapped --version` and found version 0.8.6
- ran `/nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6/bin/gl -h` got 0 exit code
- ran `/nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6/bin/gl --help` got 0 exit code
- ran `/nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6/bin/gl --version` and found version 0.8.6
- found 0.8.6 with grep in /nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6
- found 0.8.6 in filename of file in /nix/store/49m7aj5a77km9i0npzs0v4m821nmnhks-gitless-0.8.6