Motivation for this change

The old hash caused version 1.0 version to be installed instead of 1.1, for some
reason.

With old hash:

$ nix-shell --pure -p pythonPackages.PyRSS2Gen -p pythonPackages.pip --run "pip freeze"
PyRSS2Gen==1.0

With this fix:

$ nix-shell --pure -p pythonPackages.PyRSS2Gen -p pythonPackages.pip --run "pip freeze"
PyRSS2Gen==1.1

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.