cosmic-workspaces-epoch: update updateScript

(cherry picked from commit 959ce0c)

Author: HeitorAugustoLN

pkgs/by-name/co/cosmic-workspaces-epoch/package.nix

@@ -55,10 +55,9 @@ rustPlatform.buildRustPackage (finalAttrs: {
         cosmic-autologin-noxwayland
         ;
     };
+
     updateScript = nix-update-script {
       extraArgs = [
-        "--version"
-        "unstable"
         "--version-regex"
         "epoch-(.*)"
       ];