fixed pyservectl linter errors and formatting

pyserve/ctl/commands/down.py

@@ -5,7 +5,7 @@ pyserve down - Stop all services
 import signal
 import time
 from pathlib import Path
-from typing import cast
+from typing import Any, cast
 
 import click
 
@@ -31,11 +31,11 @@ import click
 )
 @click.pass_obj
 def down_cmd(
-    ctx,
+    ctx: Any,
     timeout: int,
     volumes: bool,
     remove_orphans: bool,
-):
+) -> None:
     """
     Stop and remove all services.