xonsh: 0.6.3 -> 0.6.4 (#40821)

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

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

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/zdkhffpw9yfjkxi877mildima9kp7skm-xonsh-0.6.4/bin/xon.sh had a zero exit code or showed the expected version
- /nix/store/zdkhffpw9yfjkxi877mildima9kp7skm-xonsh-0.6.4/bin/.xonsh-wrapped passed the binary check.
- /nix/store/zdkhffpw9yfjkxi877mildima9kp7skm-xonsh-0.6.4/bin/xonsh passed the binary check.
- 2 of 3 passed binary check by having a zero exit code.
- 2 of 3 passed binary check by having the new version present in output.
- found 0.6.4 with grep in /nix/store/zdkhffpw9yfjkxi877mildima9kp7skm-xonsh-0.6.4
- directory tree listing: https://gist.github.com/f4e56948f12666dc9fa8965e32e1844e
- du listing: https://gist.github.com/de490af4f1967c7d07e86d7068da2c32

pkgs/shells/xonsh/default.nix

@@ -2,13 +2,13 @@
 
 python3Packages.buildPythonApplication rec {
   name = "xonsh-${version}";
-  version = "0.6.3";
+  version = "0.6.4";
 
   src = fetchFromGitHub {
     owner = "scopatz";
     repo = "xonsh";
     rev = version;
-    sha256= "1893kkxvalx8ycjl27gixkh979kkp4ra00zb7m6a8cdllx6yhsgi";
+    sha256= "16nfvfa9cklm5qb2lrr12z7k4wjb6pbb0y0ma15riqcda56ygmj7";
   };
 
   LC_ALL = "en_US.UTF-8";