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

backend/open_webui/retrieval/web/main.py

@@ -7,6 +7,7 @@ from open_webui.retrieval.web.utils import resolve_hostname
 from open_webui.utils.misc import is_string_allowed
 from pydantic import BaseModel
 
+
 def get_filtered_results(results, filter_list):
     if not filter_list:
         return results
@@ -37,6 +38,7 @@ def get_filtered_results(results, filter_list):
 
     return filtered_results
 
+
 class SearchResult(BaseModel):
     link: str
     title: str | None