sysstat: 11.7.2 -> 11.7.3

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/2f4cmqnz0wn43pyq8qnlb7pvhk3gh7bq-sysstat-11.7.3/bin/sar --help’ got 0 exit code
- ran ‘/nix/store/2f4cmqnz0wn43pyq8qnlb7pvhk3gh7bq-sysstat-11.7.3/bin/iostat -h’ got 0 exit code
- ran ‘/nix/store/2f4cmqnz0wn43pyq8qnlb7pvhk3gh7bq-sysstat-11.7.3/bin/iostat help’ got 0 exit code
- ran ‘/nix/store/2f4cmqnz0wn43pyq8qnlb7pvhk3gh7bq-sysstat-11.7.3/bin/pidstat -h’ got 0 exit code
- ran ‘/nix/store/2f4cmqnz0wn43pyq8qnlb7pvhk3gh7bq-sysstat-11.7.3/bin/cifsiostat -h’ got 0 exit code
- ran ‘/nix/store/2f4cmqnz0wn43pyq8qnlb7pvhk3gh7bq-sysstat-11.7.3/bin/cifsiostat help’ got 0 exit code
- found 11.7.3 with grep in /nix/store/2f4cmqnz0wn43pyq8qnlb7pvhk3gh7bq-sysstat-11.7.3
- directory tree listing: https://gist.github.com/1274e29f5a0476b26643f85767b98e40