update zen browser to 1.19.3b (#14)

automated update of zen browser appimage version and hash

## changelog
from `1.19.2b` to `1.19.3b`

upstream release: https://github.com/zen-browser/desktop/releases/tag/1.19.3b

Co-authored-by: gitea actions <actions@localhost>
Reviewed-on: #14

modules/pkgs/zen-browser.nix

@@ -1,11 +1,11 @@
 {lib, ...}: {
   perSystem = {pkgs, ...}: let
     pname = "zen-browser";
-    version = "1.19.2b";
+    version = "1.19.3b";
 
     src = pkgs.fetchurl {
       url = "https://github.com/zen-browser/desktop/releases/download/${version}/zen-x86_64.AppImage";
-      hash = "sha256-lDn7rIYDgmyUnc3PdIASXfpXBXASL6TEdzyZfT716cI=";
+      hash = "sha256-p00Irv2z6brDXMx3cr0234lOZZ2a7FmJMDzN494nzMw=";
     };
 
     appimageContents = pkgs.appimageTools.extract {inherit pname version src;};