chores/remove unused package

close #3

app/httpsig.py

@@ -1,13 +1,10 @@
 #!/usr/bin/env python3
 import base64
-from urllib.request import HTTPSHandler
 import httpx
 import json
 import fastapi
 import hashlib
 from datetime import datetime
-from typing import Literal, TypedDict, cast, Any
-from typing import Optional
 from app.config import AP_CONTENT_TYPE, USER_AGENT, KEY_PATH, ID
 
 from loguru import logger