libsass: 3.5.1 -> 3.5.2

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

This update was made based on information from https://repology.org/metapackage/libsass/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 3.5.2 with grep in /nix/store/nmrdgaid01pxdciii293qs8pj79a0jm1-libsass-3.5.2
- directory tree listing: https://gist.github.com/56876c4a3406ecb01ba31b9a9dbed572

pkgs/development/libraries/libsass/default.nix

@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "libsass-${version}";
-  version = "3.5.1";
+  version = "3.5.2";
 
   src = fetchurl {
     url = "https://github.com/sass/libsass/archive/${version}.tar.gz";
-    sha256 = "0qy5hsglrdwzlb1x83v40pnm52hrjbdrc5zardp89i3vwcdzkrq8";
+    sha256 = "1qjpicbjsj9gf8s00ma0d6kw6qfnc29fhrqdkvq8427wfffj654r";
   };
 
   patchPhase = ''