[lint] fix lint errors

Author: capcom6

android_sms_gateway/domain.py

@@ -1,7 +1,6 @@
 import base64
 import dataclasses
 import datetime
-from io import BytesIO
 import typing as t
 
 from .enums import ProcessState, WebhookEvent, MessagePriority

android_sms_gateway/http.py

@@ -1,8 +1,5 @@
 import abc
 import typing as t
-import json
-
-from . import client, domain
 
 from .errors import (
     error_from_status,