fix: add type ignore for pandas DataFrame columns parameter

Add type: ignore annotation for the columns parameter when creating
an empty DataFrame, as pyright's pandas stubs don't recognize
list[str] as a valid type despite it working correctly at runtime.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: goloroden

eventsourcingdb/pandas.py

@@ -41,7 +41,7 @@ async def events_to_dataframe(events: AsyncGenerator[Event, None]) -> pd.DataFra
         event_list.append(event_dict)
 
     if len(event_list) == 0:
-        return pd.DataFrame(
+        return pd.DataFrame(  # type: ignore[call-overload]
             columns=[
                 "event_id",
                 "time",