Remove unused imports

issuu2epub.py

@@ -1,15 +1,13 @@
 import io
-import os
 import re
 import secrets
 import tempfile
-from fileinput import filename
 from pathlib import Path
 
 import click
 from ebooklib import epub  # type: ignore
 from PIL import Image
-from requests import HTTPError, auth, request
+from requests import HTTPError, request
 
 
 def parse_issuu_url(url: str) -> tuple[str, str]: