fira-code: 3.1 -> 4

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

@@ -1,11 +1,11 @@
 { stdenv, fetchzip }:
 
 let
-  version = "3.1";
+  version = "4";
 in fetchzip {
   name = "fira-code-${version}";
 
-  url = "https://github.com/tonsky/FiraCode/releases/download/${version}/FiraCode_${version}.zip";
+  url = "https://github.com/tonsky/FiraCode/releases/download/${version}/Fira_Code_v${version}.zip";
 
   postFetch = ''
     mkdir -p $out/share/fonts
@@ -13,7 +13,7 @@ in fetchzip {
     unzip -j $downloadedFile \*.ttf -d $out/share/fonts/truetype
   '';
 
-  sha256 = "1rk5hiix282b1gsxq9kqma2q9fnydj0xl9vbrd88rf7ywvn75817";
+  sha256 = "0n9qkng31ydvpdjc1an4ylpfy4x883c6czhyzvhjsmavd7bv4j9a";
 
   meta = with stdenv.lib; {
     homepage = "https://github.com/tonsky/FiraCode";