mlterm: 3.8.4 -> 3.8.6 (#41993)

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

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

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/y5kq18q0af30rvbhl25jpxrrf7czp5b8-mlterm-3.8.6/bin/mlterm had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/y5kq18q0af30rvbhl25jpxrrf7czp5b8-mlterm-3.8.6/bin/mlfc had a zero exit code or showed the expected version
- /nix/store/y5kq18q0af30rvbhl25jpxrrf7czp5b8-mlterm-3.8.6/bin/mlcc passed the binary check.
- /nix/store/y5kq18q0af30rvbhl25jpxrrf7czp5b8-mlterm-3.8.6/bin/mlclient passed the binary check.
- /nix/store/y5kq18q0af30rvbhl25jpxrrf7czp5b8-mlterm-3.8.6/bin/mlclientx passed the binary check.
- Warning: no invocation of /nix/store/y5kq18q0af30rvbhl25jpxrrf7czp5b8-mlterm-3.8.6/bin/mlterm-fb had a zero exit code or showed the expected version
- 3 of 6 passed binary check by having a zero exit code.
- 0 of 6 passed binary check by having the new version present in output.
- found 3.8.6 with grep in /nix/store/y5kq18q0af30rvbhl25jpxrrf7czp5b8-mlterm-3.8.6
- directory tree listing: https://gist.github.com/917b0ce2af6e7d2a9baa6c66857143a5
- du listing: https://gist.github.com/7b0c64048e0913af1cabbed5885116b2