xmrig-proxy: 2.5.2 -> 2.6.2 (#41032)

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-proxy/versions.

These checks were done:

- built on NixOS
- /nix/store/q9nnn2j5k9kmfayiairp8l3mjdcz228k-xmrig-proxy-2.6.2/bin/xmrig-proxy passed the binary check.
- 1 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 2.6.2 with grep in /nix/store/q9nnn2j5k9kmfayiairp8l3mjdcz228k-xmrig-proxy-2.6.2
- directory tree listing: https://gist.github.com/9498722348ccc1f87735df50817a78ac
- du listing: https://gist.github.com/c7381fd089088b8620cf7e6675c96a83