json_c: 0.13 -> 0.13.1

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

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

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 0.13.1 with grep in /nix/store/3ckha7sbyy0la7qswa3b01n3wgnccqsf-json-c-0.13.1
- directory tree listing: https://gist.github.com/cad3ba1104556e76a7088a0fd5427df9

pkgs/development/libraries/json-c/default.nix

@@ -1,10 +1,10 @@
 { stdenv, fetchurl, autoconf }:
 
 stdenv.mkDerivation rec {
-  name = "json-c-0.13";
+  name = "json-c-0.13.1";
   src = fetchurl {
     url    = "https://s3.amazonaws.com/json-c_releases/releases/${name}-nodoc.tar.gz";
-    sha256 = "01jsr647faqrcbsrmzb52s9ppa9ll4pscz4nizk3xlp98q37cwl5";
+    sha256 = "0ch1v18wk703bpbyzj7h1mkwvsw4rw4qdwvgykscypvqq10678ll";
   };
 
   outputs = [ "out" "dev" ];