csound: 6.12.2 -> 6.13.0

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/csound/versions

pkgs/applications/audio/csound/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   # When updating, please check if https://github.com/csound/csound/issues/1078
   # has been fixed in the new version so we can use the normal fluidsynth
   # version and remove fluidsynth 1.x from nixpkgs again.
-  version = "6.12.2";
+  version = "6.13.0";
 
   enableParallelBuilding = true;
 
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
     owner = "csound";
     repo = "csound";
     rev = version;
-    sha256 = "01krxcf0alw9k7p5sv0s707600an4sl7lhw3bymbwgqrj0v2p9z2";
+    sha256 = "14822ybqyp31z18gky2y9zadr9dkbhabg97y139py73w7v3af1bh";
   };
 
   cmakeFlags = [ "-DBUILD_CSOUND_AC=0" ] # fails to find Score.hpp