SSZ block V2 stack overflow (#5076)

Squashed commit of the following:

commit 2653bee
Author: Paul Hauner <paul@paulhauner.com>
Date:   Mon Jan 22 13:55:31 2024 +1100

    Revert "remove a couple boxes"

    This reverts commit cd3dde7.

commit cd3dde7
Author: realbigsean <seananderson33@GMAIL.com>
Date:   Tue Jan 16 18:03:24 2024 -0500

    remove a couple boxes

commit 8617ac2
Author: realbigsean <seananderson33@GMAIL.com>
Date:   Tue Jan 16 16:37:03 2024 -0500

    box ssz publish

beacon_node/http_api/src/lib.rs

@@ -4661,8 +4661,10 @@ pub fn serve<T: BeaconChainTypes>(
                         post_beacon_blocks_ssz
                             .uor(post_beacon_blocks_v2_ssz)
                             .uor(post_beacon_blinded_blocks_ssz)
-                            .uor(post_beacon_blinded_blocks_v2_ssz),
+                            .uor(post_beacon_blinded_blocks_v2_ssz)
+                            .boxed(),
                     )
+                    .boxed()
                     .uor(post_beacon_blocks)
                     .uor(post_beacon_blinded_blocks)
                     .uor(post_beacon_blocks_v2)
@@ -4694,6 +4696,7 @@ pub fn serve<T: BeaconChainTypes>(
                     .recover(warp_utils::reject::handle_rejection),
             ),
         )
+        .boxed()
         .recover(warp_utils::reject::handle_rejection)
         .with(slog_logging(log.clone()))
         .with(prometheus_metrics())