fix: Fix outdated imports

src/qibotn/backends/__init__.py

@@ -1,2 +1,2 @@
-from qibotn.backends.gpu import CuTensorNet
+from qibotn.backends.cutensornet import CuTensorNet
 from qibotn.backends.quimb import QuimbBackend

src/qibotn/backends/cutensornet.py

@@ -1,7 +1,7 @@
 import numpy as np
 from qibo.backends.numpy import NumpyBackend
 from qibo.config import raise_error
-from qibo.states import CircuitResult
+from qibo.result import CircuitResult
 
 
 class CuTensorNet(NumpyBackend):  # pragma: no cover

src/qibotn/backends/quimb.py

@@ -1,6 +1,6 @@
 from qibo.backends.numpy import NumpyBackend
 from qibo.config import raise_error
-from qibo.states import CircuitResult
+from qibo.result import CircuitResult
 
 
 class QuimbBackend(NumpyBackend):