remove upstreamed busybox-sandbox-shell

packaging/dependencies.nix

@@ -138,30 +138,6 @@ scope: {
       ];
   });
 
-  busybox-sandbox-shell = pkgs.busybox-sandbox-shell or (pkgs.busybox.override {
-    useMusl = true;
-    enableStatic = true;
-    enableMinimal = true;
-    extraConfig = ''
-      CONFIG_FEATURE_FANCY_ECHO y
-      CONFIG_FEATURE_SH_MATH y
-      CONFIG_FEATURE_SH_MATH_64 y
-
-      CONFIG_ASH y
-      CONFIG_ASH_OPTIMIZE_FOR_SIZE y
-
-      CONFIG_ASH_ALIAS y
-      CONFIG_ASH_BASH_COMPAT y
-      CONFIG_ASH_CMDCMD y
-      CONFIG_ASH_ECHO y
-      CONFIG_ASH_GETOPTS y
-      CONFIG_ASH_INTERNAL_GLOB y
-      CONFIG_ASH_JOB_CONTROL y
-      CONFIG_ASH_PRINTF y
-      CONFIG_ASH_TEST y
-    '';
-  });
-
   # TODO change in Nixpkgs, Windows works fine. First commit of
   # https://github.com/NixOS/nixpkgs/pull/322977 backported will fix.
   toml11 = pkgs.toml11.overrideAttrs (old: {