Skip `TFCvtModelTest::test_keras_fit_mixed_precision` for now (#23699)

fix
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

tests/models/cvt/test_modeling_tf_cvt.py

@@ -186,6 +186,7 @@ class TFCvtModelTest(TFModelTesterMixin, PipelineTesterMixin, unittest.TestCase)
     def test_keras_fit(self):
         super().test_keras_fit()
 
+    @unittest.skip(reason="Get `Failed to determine best cudnn convolution algo.` error after using TF 2.12+cuda 11.8")
     def test_keras_fit_mixed_precision(self):
         policy = tf.keras.mixed_precision.Policy("mixed_float16")
         tf.keras.mixed_precision.set_global_policy(policy)