Use pydantic.v1 namespace on all pydantic versions (#883)

With https://github.com/pydantic/pydantic/pull/9042 being shipped with
[1.10.15](https://docs.pydantic.dev/latest/changelog/#v11015-2024-04-03),
we can clean up the imports a bit until we make decisions how to move
onward with or without pydantic.

---------

Co-authored-by: Steven B. <51370195+sdb9696@users.noreply.github.com>

kasa/cli.py

@@ -14,6 +14,7 @@ from pprint import pformat as pf
 from typing import Any, cast
 
 import asyncclick as click
+from pydantic.v1 import ValidationError
 
 from kasa import (
     AuthenticationError,
@@ -42,11 +43,6 @@ from kasa.iot import (
 from kasa.iot.modules import Usage
 from kasa.smart import SmartDevice
 
-try:
-    from pydantic.v1 import ValidationError
-except ImportError:
-    from pydantic import ValidationError
-
 try:
     from rich import print as _do_echo
 except ImportError: