fix: apply ruff formatting to pass CI checks

- Fixed line length issues in logger.warning calls
- Removed trailing spaces in docstrings
- Applied consistent formatting across all files

tests/integration/test_calendar_operations.py

@@ -95,10 +95,10 @@ async def test_list_calendars(nc_client: NextcloudClient):
     calendars = await nc_client.calendar.list_calendars()
 
     assert isinstance(calendars, list)
-    
+
     if not calendars:
         pytest.skip("No calendars available - Calendar app may not be enabled")
-    
+
     logger.info(f"Found {len(calendars)} calendars")
 
     # Check structure of calendars