Update map_api.py

Author: hyzhou404

python-sdk/nuscenes/map_expansion/map_api.py

@@ -29,7 +29,7 @@
 from nuscenes.utils.geometry_utils import view_points
 
 # Recommended style to use as the plots will show grids.
-plt.style.use('seaborn-whitegrid')
+plt.style.use('seaborn-v0_8-whitegrid')
 
 # Define a map geometry type for polygons and lines.
 Geometry = Union[Polygon, LineString]