Companion for Substrate#8155 (#2478)

* Companion for Substrate#8155

https://github.com/paritytech/substrate/pull/8155

* :D

* Update the Substrate reference

polkadot/node/service/src/lib.rs

@@ -286,7 +286,7 @@ fn new_partial<RuntimeApi, Executor>(config: &mut Configuration, jaeger_agent: O
 		client.clone(),
 		select_chain.clone(),
 		inherent_data_providers.clone(),
-		&task_manager.spawn_handle(),
+		&task_manager.spawn_essential_handle(),
 		config.prometheus_registry(),
 		consensus_common::CanAuthorWithNativeVersion::new(client.executor().clone()),
 	)?;
@@ -955,7 +955,7 @@ fn new_light<Runtime, Dispatch>(mut config: Configuration) -> Result<(
 		client.clone(),
 		select_chain.clone(),
 		inherent_data_providers.clone(),
-		&task_manager.spawn_handle(),
+		&task_manager.spawn_essential_handle(),
 		config.prometheus_registry(),
 		consensus_common::NeverCanAuthor,
 	)?;