xmrig: 2.6.1 -> 2.6.2

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/xmrig/versions.

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 2.6.2 with grep in /nix/store/fql94ka6winbdld6zs5y34f2y0fbzavg-xmrig-2.6.2
- directory tree listing: https://gist.github.com/109bef229b0b8564b89f489b69f6f0b5