Can't import GraKeL due to a numpy import error

[edisnord]

Describe the bug
When trying to import GraKel, I get an error due to a numpy import which doesn't seem to be located in the same place in the package anymore. I'm using numpy version 2.1.1

To Reproduce
Write import grakel in an empty file and run as a python script.

Expected behavior
The script should run without any errors.

Stack Trace

{
	"name": "ImportError",
	"message": "cannot import name 'ComplexWarning' from 'numpy' (/home/edishasaj/.local/share/virtualenvs/GNN/lib64/python3.12/site-packages/numpy/__init__.py)",
	"stack": "---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
Cell In[6], line 1
----> 1 import grakel
      3 gk_computer = grakel.GraphletSampling(k=5)

File ~/.local/share/virtualenvs/GNN/lib64/python3.12/site-packages/grakel/__init__.py:6
      2 from grakel import datasets
      4 from grakel.graph import Graph
----> 6 from grakel.graph_kernels import GraphKernel
      9 from grakel.kernels import Kernel
     11 from grakel.kernels import GraphletSampling

File ~/.local/share/virtualenvs/GNN/lib64/python3.12/site-packages/grakel/graph_kernels.py:13
     10 from sklearn.utils import check_random_state
     11 from sklearn.utils.validation import check_is_fitted
---> 13 from grakel.kernels import GraphletSampling
     14 from grakel.kernels import RandomWalk
     15 from grakel.kernels import RandomWalkLabeled

File ~/.local/share/virtualenvs/GNN/lib64/python3.12/site-packages/grakel/kernels/__init__.py:7
      4 from grakel.kernels.kernel import Kernel
      6 from grakel.kernels.graphlet_sampling import GraphletSampling
----> 7 from grakel.kernels.random_walk import RandomWalk
      8 from grakel.kernels.random_walk import RandomWalkLabeled
      9 from grakel.kernels.shortest_path import ShortestPath

File ~/.local/share/virtualenvs/GNN/lib64/python3.12/site-packages/grakel/kernels/random_walk.py:10
      6 import numpy as np
      8 from itertools import product
---> 10 from numpy import ComplexWarning
     11 from numpy.linalg import inv
     12 from numpy.linalg import eig

ImportError: cannot import name 'ComplexWarning' from 'numpy' (~/.local/share/virtualenvs/GNN/lib64/python3.12/site-packages/numpy/__init__.py)"
}

[ysig]

@edisnord please suggest a fix/pull-request probably a latest version problem. I suggest doing it the following way.

if np.__version__ < 'X':
   from numpy import ComplexWarning
else:
  from ... # the updated import