insomnia: 5.16.1 -> 5.16.2

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

This update was made based on information from https://repology.org/metapackage/insomnia/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 5.16.2 with grep in /nix/store/9jcvxvs1y2jycaq8n26zidh7y3shicp0-insomnia-5.16.2
- directory tree listing: https://gist.github.com/a02ce6405af5678bfbbd0fd9a116e95e