xmr-stak: 2.4.4 -> 2.4.5

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/wbq2l97g7y24hnbz1zzs17yl8qh1csd3-xmr-stak-2.4.5/bin/xmr-stak passed the binary check.
- Warning: no invocation of /nix/store/wbq2l97g7y24hnbz1zzs17yl8qh1csd3-xmr-stak-2.4.5/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 2.4.5 with grep in /nix/store/wbq2l97g7y24hnbz1zzs17yl8qh1csd3-xmr-stak-2.4.5
- directory tree listing: https://gist.github.com/d748f1490c29ab43e9426b5d283a5e4e
- du listing: https://gist.github.com/06e416d3c3db5caf733655c9ab632eea