fix: override nixpkgs input of devour-flake

Signed-off-by: Reputable2722 <153411261+Reputable2772@users.noreply.github.com>

Author: Reputable2772

Shells/ci.nix

@@ -20,6 +20,7 @@
             --nix-eval-jobs ${pkgs.lixPackageSets.latest.nix-eval-jobs}/bin/nix-eval-jobs \
             --flake ${inputs.devour-flake}#packages.${pkgs.stdenv.hostPlatform.system}.default \
             --no-nom \
+            --override-input nixpkgs ${inputs.nixpkgs} \
             "$@"
         '';
       })