Exclude jax from RNN tests for now

keras_core/layers/rnn/rnn_test.py

@@ -1,5 +1,7 @@
 import numpy as np
+import pytest
 
+from keras_core import backend
 from keras_core import layers
 from keras_core import operations as ops
 from keras_core import testing
@@ -66,6 +68,10 @@ class TwoStatesRNNCell(layers.Layer):
         return output, [output_1, output_2]
 
 
+@pytest.mark.skipif(
+    backend.backend() != "tensorflow",
+    reason="Only implemented for TF for now.",
+)
 class RNNTest(testing.TestCase):
     def test_compute_output_shape_single_state(self):
         sequence = np.ones((3, 4, 5))