Merge pull request #676 from k-nasa/async_task_bump_to1.2.1

update async-task to 1.2.1

Cargo.toml

@@ -50,7 +50,7 @@ std = [
 
 [dependencies]
 async-attributes = { version = "1.1.1", optional = true }
-async-task = { version = "1.0.0", optional = true }
+async-task = { version = "1.2.1", optional = true }
 broadcaster = { version = "0.2.6", optional = true, default-features = false, features = ["default-channels"] }
 crossbeam-channel = { version = "0.4.0", optional = true }
 crossbeam-deque = { version = "0.7.2", optional = true }