check: 0.11.0 -> 0.12.0

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/884zd0n1kqjfm8gkk2ql8rzwshr6ldhl-check-0.12.0/bin/checkmk -h’ got 0 exit code
- ran ‘/nix/store/884zd0n1kqjfm8gkk2ql8rzwshr6ldhl-check-0.12.0/bin/checkmk --help’ got 0 exit code
- found 0.12.0 with grep in /nix/store/884zd0n1kqjfm8gkk2ql8rzwshr6ldhl-check-0.12.0
- directory tree listing: https://gist.github.com/96299205c5d86d2f1eda8b58f2c95588