xmr-stak: 2.4.3 -> 2.4.4 (#41506)

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
- /nix/store/bfj12k7pz2bj2jzx3swkmz2kk3dfqx5p-xmr-stak-2.4.4/bin/xmr-stak passed the binary check.
- Warning: no invocation of /nix/store/bfj12k7pz2bj2jzx3swkmz2kk3dfqx5p-xmr-stak-2.4.4/bin/libxmrstak_opencl_backend.so had a zero exit code or showed the expected version
- 1 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 2.4.4 with grep in /nix/store/bfj12k7pz2bj2jzx3swkmz2kk3dfqx5p-xmr-stak-2.4.4
- directory tree listing: https://gist.github.com/5ef7f1fd13c10bef56522a028b52c82e
- du listing: https://gist.github.com/be63ac59af2a152db46085c4509cdcd3