fix CUDA test to use reduce

Signed-off-by: Andrew Duffy <andrew@a10y.dev>

Author: a10y

vortex-cuda/src/kernel/encodings/bitpacked.rs

@@ -169,12 +169,10 @@ where
 mod tests {
     use futures::executor::block_on;
     use rstest::rstest;
-    use vortex::array::ExecutionCtx;
     use vortex::array::IntoArray;
     use vortex::array::arrays::PrimitiveArray;
     use vortex::array::assert_arrays_eq;
     use vortex::array::dtype::NativePType;
-    use vortex::array::session::ArraySession;
     use vortex::array::validity::Validity::NonNullable;
     use vortex::buffer::Buffer;
     use vortex::error::VortexExpect;
@@ -521,10 +519,9 @@ mod tests {
             .vortex_expect("operation should succeed in test");
         let slice_ref = bitpacked_array.clone().into_array().slice(67..3969)?;
         let bitpacked_ref = bitpacked_array.into_array();
-        let mut exec_ctx = ExecutionCtx::new(VortexSession::empty().with::<ArraySession>());
         let sliced_array = bitpacked_ref
             .vtable()
-            .execute_parent(&bitpacked_ref, &slice_ref, 0, &mut exec_ctx)?
+            .reduce_parent(&bitpacked_ref, &slice_ref, 0)?
             .expect("expected slice kernel to execute");
         let cpu_result = sliced_array.to_canonical()?;
         let gpu_result = block_on(async {