fira-code: avoid use of rec

Signed-off-by: Sefa Eyeoglu <[e-mail]>

pkgs/data/fonts/fira-code/default.nix

···
 { lib, stdenvNoCC, fetchzip, useVariableFont ? true }:
 
-stdenvNoCC.mkDerivation rec {
+stdenvNoCC.mkDerivation (finalAttrs: {
   pname = "fira-code";
   version = "6.2";
 
   src = fetchzip {
-    url = "https://github.com/tonsky/FiraCode/releases/download/${version}/Fira_Code_v${version}.zip";
+    url = "https://github.com/tonsky/FiraCode/releases/download/${finalAttrs.version}/Fira_Code_v${finalAttrs.version}.zip";
     stripRoot = false;
     hash = "sha256-UHOwZL9WpCHk6vZaqI/XfkZogKgycs5lWg1p0XdQt0A=";
   };
···
     maintainers = [ maintainers.rycee ];
     platforms = platforms.all;
   };
-}
+})