nixos/resolved: Include dbus alias of resolved unit

This will make dbus socket activation for it work

When `systemd-resolved` is restarted; this would lead to unavailability
of DNS lookups.  You're supposed to use DBUS socket activation to buffer
resolved requests; such that restarts happen without downtime

nixos/modules/system/boot/resolved.nix

@@ -144,6 +144,7 @@ in
 
     systemd.additionalUpstreamSystemUnits = [
       "systemd-resolved.service"
+      "dbus-org.freedesktop.resolve1.service"
     ];
 
     systemd.services.systemd-resolved = {