iosevka: 1.14.1 -> 1.14.2

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

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

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 1.14.2 with grep in /nix/store/57g5hfljvvnlp3pzvvg16rxp8izrdh7q-iosevka-1.14.2
- directory tree listing: https://gist.github.com/36df1a4bd1bda5184b07e7bbd902e1b4