Use io-event-select-closed branch.

Author: ioquatix

gems.rb

@@ -9,7 +9,7 @@
 
 gemspec
 
-# gem "io-event", git: "https://github.com/socketry/io-event.git"
+gem "io-event", git: "https://github.com/socketry/io-event.git", branch: "io-event-select-closed"
 
 # In order to capture both code paths in coverage, we need to optionally load this gem:
 if ENV["FIBER_PROFILER_CAPTURE"] == "true"