style: apply ruff auto-fixes

cmdnat/pipe.py

@@ -4,7 +4,6 @@ import sys
 import json
 import socket
 import re
-import subprocess
 from urllib.parse import urlparse, parse_qs
 from pathlib import Path
 from cmdlet._shared import Cmdlet, CmdletArg, parse_cmdlet_args, resolve_tidal_manifest_path