adapta-gtk-theme: 3.93.1.18 -> 3.93.1.22

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

This update was made based on information from https://repology.org/metapackage/adapta-gtk-theme/versions.

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- directory tree listing: https://gist.github.com/e6801ef270b37b8b69012340d257786e
- du listing: https://gist.github.com/50a1c6c1c9f0e79a349f8b5a83d10300