riot-web: 0.14.0 -> 0.14.1

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

This update was made based on information from https://repology.org/metapackage/riot-web/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 0.14.1 with grep in /nix/store/77d4rg2yy4gj8m1mvrw6zqhdi7jv7cg8-riot-web-0.14.1
- directory tree listing: https://gist.github.com/4606f4af0dcfc7ef1ece43dfe4b38abe