Surpress excessive warning in Scheduler#async. Fixes #410.

Author: ioquatix

lib/async/scheduler.rb

@@ -583,7 +583,8 @@ def run(...)
 		# @yields {|task| ...} Executed within the task.
 		# @returns [Task] The task that was scheduled into the reactor.
 		def async(*arguments, **options, &block)
-			warn("Async::Scheduler#async is deprecated. Use `run` or `Task#async` instead.", uplevel: 1, category: :deprecated) if $VERBOSE
+			# Since this method is called by `run`, this warning is too excessive:
+			# warn("Async::Scheduler#async is deprecated. Use `run` or `Task#async` instead.", uplevel: 1, category: :deprecated) if $VERBOSE
 
 			Kernel.raise ClosedError if @selector.nil?
 

releases.md

@@ -1,5 +1,9 @@
 # Releases
 
+## Unreleased
+
+  - Suppress excessive warning in `Async::Scheduler#async`.
+
 ## v2.27.3
 
   - Ensure trace attributes are strings, fixes integration with OpenTelemetry.