[Pallas] Add version guard for non-32-bit selection in test and fix github build failure.

PiperOrigin-RevId: 707645847

Author: bythew3i

tests/pallas/tpu_ops_test.py

@@ -254,6 +254,8 @@ def body(x_ref, y_ref):
 
   @parameterized.product(dtype=[jnp.float32, jnp.bfloat16, jnp.int8])
   def test_cast_vector_to_mask(self, dtype):
+    if jtu.jaxlib_version() <= (0, 4, 39):
+      self.skipTest("Test requires non-32-bit selection support")
     shape = (128, 128)
     bitwidth = pallas_utils.dtype_bitwidth(dtype)
     if (