Companion to substrate #10196 - Add group name in task metrics (#732)

* Use blank task group name

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* cargo fmt

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* Update

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* update Cargo.lock and switch from 0.9.12 to master

* format with LATEST nightly

Co-authored-by: Andronik Ordian <write@reusable.software>

client/collator/src/lib.rs

@@ -390,7 +390,7 @@ mod tests {
 				.build()
 				.expect("Builds overseer");
 
-		spawner.spawn("overseer", overseer.run().then(|_| async { () }).boxed());
+		spawner.spawn("overseer", None, overseer.run().then(|_| async { () }).boxed());
 
 		let collator_start = start_collator(StartCollatorParams {
 			runtime_api: client.clone(),