fox_1_6: 1.6.56 -> 1.6.57

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/0d83j376zvh006b5slmgdx86bcm3dxkm-fox-1.6.57/bin/reswrap -h’ got 0 exit code
- ran ‘/nix/store/0d83j376zvh006b5slmgdx86bcm3dxkm-fox-1.6.57/bin/reswrap --help’ got 0 exit code
- ran ‘/nix/store/0d83j376zvh006b5slmgdx86bcm3dxkm-fox-1.6.57/bin/fox-config --version’ and found version 1.6.57
- found 1.6.57 with grep in /nix/store/0d83j376zvh006b5slmgdx86bcm3dxkm-fox-1.6.57
- directory tree listing: https://gist.github.com/baa2d8696211116ff0be92b664965741

pkgs/development/libraries/fox/fox-1.6.nix

@@ -3,7 +3,7 @@
 , CoreServices }:
 
 let
-  version = "1.6.56";
+  version = "1.6.57";
 in
 
 stdenv.mkDerivation rec {
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "ftp://ftp.fox-toolkit.org/pub/${name}.tar.gz";
-    sha256 = "1ckcb12gblz1ad1371ah1qirxn3r9zdngh9w0357hsqfmkyfa5y5";
+    sha256 = "08w98m6wjadraw1pi13igzagly4b2nfa57kdqdnkjfhgkvg1bvv5";
   };
 
   buildInputs = [