nixos/stubby: set Type=notify on the systemd service
nixos/stubby: set Type=notify on the systemd service

Fixes some dependency ordering problems at boot time with services that
require DNS. Without Type=notify these services might be started before
stubby was ready to accept DNS requests.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs