fix: change import to remove DeprecationWarning

Author: mirkodandrea

src/propagator/io/writer/isochrones_geojson.py

@@ -9,9 +9,8 @@
 from pyproj import CRS
 from rasterio.features import shapes  # type: ignore
 from rasterio.transform import Affine  # type: ignore
-from scipy.ndimage.filters import gaussian_filter1d
-from scipy.ndimage.morphology import binary_dilation, binary_erosion
-from scipy.signal.signaltools import medfilt2d
+from scipy.ndimage import binary_dilation, binary_erosion, gaussian_filter1d
+from scipy.signal import medfilt2d
 from shapely.geometry import LineString, MultiLineString, shape
 
 from propagator.core.models import PropagatorOutput