python3Packages.scipy: 1.6.0 -> 1.6.1

[rmcgibbo]

Motivation for this change

https://github.com/scipy/scipy/releases/tag/v1.6.1

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.

[fabaff]

Could you please update the description and add the license while you are on it?

  description = "SciPy (pronounced 'Sigh Pie') is open-source software for mathematics, science, and engineering";

    license = licenses.bsd3;

Thanks.