libwacom: 2.6.0 -> 2.7.0

Diff: https://github.com/linuxwacom/libwacom/compare/libwacom-2.6.0...libwacom-2.7.0

Changelog: https://github.com/linuxwacom/libwacom/blob/libwacom-2.7.0/NEWS

pkgs/development/libraries/libwacom/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "libwacom";
-  version = "2.6.0";
+  version = "2.7.0";
 
   outputs = [ "out" "dev" ];
 
···
     owner = "linuxwacom";
     repo = "libwacom";
     rev = "libwacom-${version}";
-    sha256 = "sha256-9zqW6zPrFcxv/yAAtFgdVavKVMXeDBoMP3E/XriUcT0=";
+    sha256 = "sha256-NNfhZMshM5U/EfJHuNgkDe5NEkEGKtJ56vSpXyGf/xw=";
   };
 
   postPatch = ''