refac: modernize type annotations (PEP 604 / PEP 585)

backend/open_webui/utils/pdf_generator.py

@@ -1,15 +1,13 @@
+import site
 from datetime import datetime
+from html import escape
 from io import BytesIO
 from pathlib import Path
-from typing import Dict, Any, List
-from html import escape
+from typing import Any, Dict, List
 
-from markdown import markdown
-
-import site
 from fpdf import FPDF
-
-from open_webui.env import STATIC_DIR, FONTS_DIR
+from markdown import markdown
+from open_webui.env import FONTS_DIR, STATIC_DIR
 from open_webui.models.chats import ChatTitleMessagesForm