duktape: 2.2.0 -> 2.2.1

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

This update was made based on information from https://repology.org/metapackage/duktape/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 2.2.1 with grep in /nix/store/8clll9a9f797fd0vxz3vmx641mpqzkkx-duktape-2.2.1
- directory tree listing: https://gist.github.com/6049cc6fc921f7fa2efb27f86c1c7ca6