pynac: 0.7.19 -> 0.7.21 (#41662)

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

This update was made based on information from https://repology.org/metapackage/pynac/versions.

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 0.7.21 with grep in /nix/store/883yhmfc1k4vz1dd37l73v7clvnyaa3v-pynac-0.7.21
- directory tree listing: https://gist.github.com/a0f53cebb1c4cae07c81edef938ac632
- du listing: https://gist.github.com/78800724710d0766e4add7ed1847c3fc

pkgs/applications/science/math/pynac/default.nix

@@ -9,14 +9,14 @@
 }:
 
 stdenv.mkDerivation rec {
-  version = "0.7.19";
+  version = "0.7.21";
   name = "pynac-${version}";
 
   src = fetchFromGitHub {
     owner = "pynac";
     repo = "pynac";
     rev = "pynac-${version}";
-    sha256 = "132bibvapm245c5xy29j3xmjs0pawvw7lv05374m8vv1m39127d3";
+    sha256 = "072mdziyx52y0knxjf2hs6nab36bckkanp7g6ff6qiy4fm0v8q04";
   };
 
   buildInputs = [