[OpenVINO backend] Update ndim behavior

[p-wysocki]

The current implementation uses API which is deprecated and set up for removal in the upcoming releases. This PR updates ndim function to use the recommended API.

The change is tested by:

keras/keras/src/ops/numpy_test.py

Lines 1527 to 1529 in 785c9b0

	def test_ndim(self):
	x = KerasTensor((None, 3))
	self.assertEqual(knp.ndim(x).shape, (2,))

Additionally, import openvino.runtime is deprecated and it's recommended to replace it with import openvino.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.60%. Comparing base (785c9b0) to head (1b4162c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21317      +/-   ##
==========================================
- Coverage   82.60%   82.60%   -0.01%     
==========================================
  Files         565      565              
  Lines       54773    54771       -2     
  Branches     8508     8508              
==========================================
- Hits        45244    45242       -2     
  Misses       7439     7439              
  Partials     2090     2090              

Flag	Coverage Δ
keras	82.41% <100.00%> (-0.01%)	⬇️
keras-jax	63.56% <0.00%> (+<0.01%)	⬆️
keras-numpy	58.71% <0.00%> (+<0.01%)	⬆️
keras-openvino	33.12% <100.00%> (-0.01%)	⬇️
keras-tensorflow	63.96% <0.00%> (+<0.01%)	⬆️
keras-torch	63.62% <0.00%> (+<0.01%)	⬆️

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[mlukasze]

Info for reviewers - author of PR is one of maintaners for OpenVINO python API.
He knows what he is doing.

[p-wysocki]

The CI is failing with pre-commit check api-gen, but there's no explicit error message. I ran the generation script as instructed in https://github.com/keras-team/keras?tab=readme-ov-file#minimal-installation with .shell/api_gen.sh, but it updated ~130 files with changes which are irrelevant, for example:

diff --git a/keras/api/optimizers/__init__.py b/keras/api/optimizers/__init__.py
index 40f6ab401..4114fab5b 100644
--- a/keras/api/optimizers/__init__.py
+++ b/keras/api/optimizers/__init__.py
@@ -4,6 +4,7 @@ This file was autogenerated. Do not edit it by hand,
 since your modifications would be overwritten.
 """

+
 from keras.optimizers import legacy as legacy
 from keras.optimizers import schedules as schedules
 from keras.src.optimizers import deserialize as deserialize
@@ -18,9 +19,7 @@ from keras.src.optimizers.adamw import AdamW as AdamW
 from keras.src.optimizers.ftrl import Ftrl as Ftrl
 from keras.src.optimizers.lamb import Lamb as Lamb
 from keras.src.optimizers.lion import Lion as Lion
-from keras.src.optimizers.loss_scale_optimizer import (
-    LossScaleOptimizer as LossScaleOptimizer,
-)
+from keras.src.optimizers.loss_scale_optimizer import LossScaleOptimizer as LossScaleOptimizer
 from keras.src.optimizers.muon import Muon as Muon

Is this expected?