libsigcxx30: 3.6.0 -> 3.8.1

Diff: https://github.com/libsigcplusplus/libsigcplusplus/compare/3.6.0...3.8.1

Changelog: https://github.com/libsigcplusplus/libsigcplusplus/blob/3.8.1/NEWS

pkgs/development/libraries/libsigcxx/3.0.nix

@@ -1,20 +1,22 @@
 {
   stdenv,
   lib,
-  fetchurl,
+  fetchFromGitHub,
   pkg-config,
   meson,
   ninja,
   gnome,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "libsigc++";
-  version = "3.6.0";
+  version = "3.8.1";
 
-  src = fetchurl {
-    url = "mirror://gnome/sources/libsigc++/${lib.versions.majorMinor version}/libsigc++-${version}.tar.xz";
-    sha256 = "w9I7N9/W458uCfCRt3sVQfv6F8Twtr9cibrvcikIDhc=";
+  src = fetchFromGitHub {
+    owner = "libsigcplusplus";
+    repo = "libsigcplusplus";
+    tag = finalAttrs.version;
+    hash = "sha256-ZV1gcq/efFaf4MkkDZP9Z1isNqwnvUWWouVwtTnpyhc=";
   };
 
   outputs = [
@@ -40,9 +42,10 @@ stdenv.mkDerivation rec {
 
   meta = {
     homepage = "https://libsigcplusplus.github.io/libsigcplusplus/";
+    changelog = "https://github.com/libsigcplusplus/libsigcplusplus/blob/${finalAttrs.src.tag}/NEWS";
     description = "Typesafe callback system for standard C++";
     license = lib.licenses.lgpl21Plus;
     teams = [ lib.teams.gnome ];
     platforms = lib.platforms.all;
   };
-}
+})