keepass: 2.38 -> 2.39

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/0w1c39pg7347dwhkwz3b5jizzzc5v885-keepass-2.39/bin/.keepass-wrapped --help’ got 0 exit code
- ran ‘/nix/store/0w1c39pg7347dwhkwz3b5jizzzc5v885-keepass-2.39/bin/keepass --help’ got 0 exit code
- found 2.39 with grep in /nix/store/0w1c39pg7347dwhkwz3b5jizzzc5v885-keepass-2.39
- directory tree listing: https://gist.github.com/da7324a17ad7e95a053f6a2655ec07bc