fix: type hints for styling function

app.py

@@ -1,6 +1,7 @@
 import subprocess
 import gradio as gr
 import pandas as pd
+import pandas.io.formats.style as style
 from apscheduler.schedulers.background import BackgroundScheduler
 from huggingface_hub import snapshot_download
 
@@ -76,7 +77,7 @@ def update_table(
     return df
 
 
-def apply_format_styling(df: pd.DataFrame) -> pd.io.formats.style.Styler:
+def apply_format_styling(df: pd.DataFrame) -> style.Styler:
     df = df.style.format(
         {c: "{:.1f}" for c in BENCHMARK_COLS} | {AutoEvalColumn.average.name: "{:.2f}"}
     )