openfst: 1.6.6 -> 1.6.7

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

This update was made based on information from https://repology.org/metapackage/openfst/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 1.6.7 with grep in /nix/store/38nl69xxg8n8qjv95bsmypfqd5jqhdl8-openfst-1.6.7
- directory tree listing: https://gist.github.com/bf617c469da4df6bef7fc0c08bb30666

pkgs/development/libraries/openfst/default.nix

@@ -3,11 +3,11 @@
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";
   pname = "openfst";
-  version = "1.6.6";
+  version = "1.6.7";
 
   src = fetchurl {
     url = "http://www.openfst.org/twiki/pub/FST/FstDownload/${name}.tar.gz";
-    sha256 = "1b13nzf9xh1iv0k8z7sdfs9ya2ykf0gzjiixpb1qn3bydck6ppdm";
+    sha256 = "1xqpc1qlvghprwih99immsjh3ba08lg754cf5icnmpkwh9nlh6p2";
   };
   meta = {
     description = "Library for working with finite-state transducers";