signal-desktop: 1.6.1 -> 1.7.0

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/signal-desktop/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 1.7.0 with grep in /nix/store/xkslw2sdzbpbzy0ddd0f5qxk1wkfahs6-signal-desktop-1.7.0
- directory tree listing: https://gist.github.com/05c86387ecf6ea0334f3d0c18b44542e

pkgs/applications/networking/instant-messengers/signal-desktop/default.nix

@@ -40,13 +40,13 @@ in
   stdenv.mkDerivation rec {
     name = "signal-desktop-${version}";
 
-    version = "1.6.1";
+    version = "1.7.0";
 
     src =
       if stdenv.system == "x86_64-linux" then
         fetchurl {
           url = "https://updates.signal.org/desktop/apt/pool/main/s/signal-desktop/signal-desktop_${version}_amd64.deb";
-          sha256 = "0q2qzl84ifnhcn1qbq38fdpj8ry748h6dlzp2mdpkslsh8mc46as";
+          sha256 = "19cbv15lizgf7fwxsrd8wrwcl1yan9rvajnvh06jb2zhc5zp47vp";
         }
       else
         throw "Signal for Desktop is not currently supported on ${stdenv.system}";