xmr-stak: 2.3.0 -> 2.4.3

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/xdp6rb1bvdmpkd77vbqq8dq175dfvrvl-xmr-stak-2.4.3/bin/xmr-stak -h’ got 0 exit code
- ran ‘/nix/store/xdp6rb1bvdmpkd77vbqq8dq175dfvrvl-xmr-stak-2.4.3/bin/xmr-stak --help’ got 0 exit code
- found 2.4.3 with grep in /nix/store/xdp6rb1bvdmpkd77vbqq8dq175dfvrvl-xmr-stak-2.4.3
- directory tree listing: https://gist.github.com/ba044f08ae439ad36ac7e143f14e0fb0