Rename interpolation_utils.py to interpolation.py

Author: VeckoTheGecko

src/parcels/utils/interpolation_utils.py renamed to src/parcels/_core/utils/interpolation.py

@@ -8,7 +8,7 @@
 import xarray as xr
 from dask import is_dask_collection
 
-import parcels.utils.interpolation_utils as i_u
+import parcels._core.utils.interpolation as i_u
 
 if TYPE_CHECKING:
     from parcels._core.field import Field, VectorField

src/parcels/interpolators.py

@@ -189,7 +189,7 @@ def AdvectionAnalytical(particles, fieldset):  # pragma: no cover
     """
     import numpy as np
 
-    import parcels.utils.interpolation_utils as i_u
+    import parcels._core.utils.interpolation as i_u
 
     tol = 1e-10
     I_s = 10  # number of intermediate time steps