libtommath: 1.2.0 -> 1.2.1

pkgs/development/libraries/libtommath/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "libtommath";
-  version = "1.2.0";
+  version = "1.2.1";
 
   src = fetchurl {
     url = "https://github.com/libtom/libtommath/releases/download/v${version}/ltm-${version}.tar.xz";
-    sha256 = "1c8q1qy88cjhdjlk3g24mra94h34c1ldvkjz0n2988c0yvn5xixp";
+    sha256 = "sha256-mGAl17N0J2/uLjDpnzZJ5KwNuKAiV6N+4Q6ucqvtDR8=";
   };
 
   nativeBuildInputs = [ libtool ];