chore: fix nilearn import

Author: mgxd

nibabies/utils/viz.py

@@ -211,8 +211,8 @@ def plot_carpet(
         legend = False
 
     else:  # Volumetric NIfTI
-        from nilearn._utils import check_niimg_4d
         from nilearn._utils.niimg import _safe_get_data
+        from nilearn._utils.niimg_conversions import check_niimg_4d
 
         img_nii = check_niimg_4d(
             img,