elvish: remove unnecessary deps.nix

fully vendorized now

pkgs/shells/elvish/default.nix

···
     sha256 = "0alsv04iihrk1nffp6fmyzxid26dqhg1k45957c2ymyzyq9cglxj";
   };
 
-  goDeps = ./deps.nix;
-
   meta = with stdenv.lib; {
     description = "A friendly and expressive Unix shell";
     homepage = https://github.com/elves/elvish;

pkgs/shells/elvish/deps.nix

···
-[
-  {
-    goPackagePath = "github.com/elves/getopt";
-    fetch = {
-      type = "git";
-      url = "https://github.com/elves/getopt";
-      rev = "f91a7bf920995832d55a1182f26657bc975b9c24";
-      sha256 = "0wz5dz0iq1b1c2w30mmcgll9xidsrnlvs2906jw9szy0h67310za";
-    };
-  }
-  {
-    goPackagePath = "github.com/mattn/go-sqlite3";
-    fetch = {
-      type = "git";
-      url = "https://github.com/mattn/go-sqlite3";
-      rev = "b4142c444a8941d0d92b0b7103a24df9cd815e42";
-      sha256 = "0xq2y4am8dz9w9aaq24s1npg1sn8pf2gn4nki73ylz2fpjwq9vla";
-    };
-  }
-]