Changed parameter type hinting.

app.py

@@ -24,7 +24,7 @@ def load_knowledge_base_index():
     return index
 
 
-def vector_search(query: list[str], model: SentenceTransformer, index, num_results=10):
+def vector_search(query: list, model: SentenceTransformer, index, num_results=10):
     vector = model.encode(list(query), show_progress_bar=False, convert_to_numpy=True)
     D, I = index.search(np.array(vector).astype("float32"), k=num_results)
     return D, I