Remove duplicate shellcheck in dev-shell.nix

Author: fzakaria

packaging/dev-shell.nix

@@ -118,7 +118,6 @@ pkgs.nixComponents2.nix-util.overrideAttrs (
           ++ [
             pkgs.buildPackages.cmake
             pkgs.buildPackages.gnused
-            pkgs.buildPackages.shellcheck
             pkgs.buildPackages.changelog-d
             modular.pre-commit.settings.package
             (pkgs.writeScriptBin "pre-commit-hooks-install" modular.pre-commit.settings.installationScript)