Motivation for this change

aiomultiprocess presents a simple interface, while running a full
AsyncIO event loop on each child process, enabling levels of
concurrency never before seen in a Python application. Each child
process can execute multiple coroutines at once, limited only by
the workload and number of cores available.

https://github.com/omnilib/aiomultiprocess

This will be needed for an update of the theHarvester package.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.