Update to consensus-specs v1.1.9 (#3016)

## Issue Addressed

Closes #3014

## Proposed Changes

- Rename `receipt_root` to `receipts_root`
- Rename `execute_payload` to `notify_new_payload`
   - This is slightly weird since we modify everything except the actual HTTP call to the engine API. That change is expected to be implemented in #2985 (cc @ethDreamer)
- Enable "random" tests for Bellatrix.

## Notes

This will break *partially* compatibility with Kintusgi testnets in order to gain compatibility with [Kiln](https://hackmd.io/@n0ble/kiln-spec) testnets. I think it will only break the BN APIs due to the `receipts_root` change, however it might have some other effects too.

Co-authored-by: Michael Sproul <micsproul@gmail.com>

beacon_node/execution_layer/src/engine_api.rs

@@ -55,7 +55,7 @@ pub trait EngineApi {
         block_hash: Hash256,
     ) -> Result<Option<ExecutionBlock>, Error>;
 
-    async fn execute_payload_v1<T: EthSpec>(
+    async fn notify_new_payload_v1<T: EthSpec>(
         &self,
         execution_payload: ExecutionPayload<T>,
     ) -> Result<ExecutePayloadResponse, Error>;