tachyon: 0.98.9 -> 0.99b2

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

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

These checks were done:

- built on NixOS
- ran `/nix/store/xpwz7yb6jqisimg2rw0xn5zh8n8i89fb-tachyon-0.99b2/bin/tachyon help` got 0 exit code
- directory tree listing: https://gist.github.com/755515ff78d7dad0ef3e73cb3333c2d4