Exclude segment_3d_image from coverage

Author: ehrenfeu

src/imcflibs/imagej/objects3d.py

@@ -80,7 +80,7 @@ def segment_3d_image(
     max_vol=None,
     remove_touching_borders=False,
     remove_touching_borders_z=False,
-):
+):  # pragma: no cover (Jython-only)
     """Segment a 3D binary image to get a labelled stack.
 
     Parameters