monit: 5.23.0 -> 5.25.1

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/qphnal7xszj71fmmy0l2kvz2d3bqpw1x-monit-5.25.1/bin/monit -h` got 0 exit code
- ran `/nix/store/qphnal7xszj71fmmy0l2kvz2d3bqpw1x-monit-5.25.1/bin/monit --help` got 0 exit code
- ran `/nix/store/qphnal7xszj71fmmy0l2kvz2d3bqpw1x-monit-5.25.1/bin/monit -V` and found version 5.25.1
- ran `/nix/store/qphnal7xszj71fmmy0l2kvz2d3bqpw1x-monit-5.25.1/bin/monit --version` and found version 5.25.1
- found 5.25.1 with grep in /nix/store/qphnal7xszj71fmmy0l2kvz2d3bqpw1x-monit-5.25.1
- found 5.25.1 in filename of file in /nix/store/qphnal7xszj71fmmy0l2kvz2d3bqpw1x-monit-5.25.1

cc "@raskin @wmertens"