libyaml: 0.1.7 -> 0.2.1

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

This update was made based on information from https://repology.org/metapackage/libyaml/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 0.2.1 with grep in /nix/store/bn221ypclyhac7pzicwf0kj7b6g03d4v-libyaml-0.2.1
- directory tree listing: https://gist.github.com/a183f8e1406cfb340cfc7e4809746583
- du listing: https://gist.github.com/6731d94c1363109427d6793cc7cd010a

pkgs/development/libraries/libyaml/default.nix

@@ -1,13 +1,13 @@
 { stdenv, fetchurl, fetchpatch }:
 let
-  version = "0.1.7";
+  version = "0.2.1";
 in
 stdenv.mkDerivation {
   name = "libyaml-${version}";
 
   src = fetchurl {
     url = "https://pyyaml.org/download/libyaml/yaml-${version}.tar.gz";
-    sha256 = "0a87931cx5m14a1x8rbjix3nz7agrcgndf4h392vm62a4rby9240";
+    sha256 = "1karpcfgacgppa82wm2drcfn2kb6q2wqfykf5nrhy20sci2i2a3q";
   };
 
   meta = with stdenv.lib; {