monit: 5.25.1 -> 5.25.2

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

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

These checks were done:

- built on NixOS
- /nix/store/mh4qnd2ljfha67cv20lvkiyxr1cj0ar7-monit-5.25.2/bin/monit passed the binary check.
- 1 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 5.25.2 with grep in /nix/store/mh4qnd2ljfha67cv20lvkiyxr1cj0ar7-monit-5.25.2
- directory tree listing: https://gist.github.com/510e765f79571ddc4c2542c69dffc6f3
- du listing: https://gist.github.com/31af9a371bca965d4d606614e84025d4