Collect inherited objects after fork.

Assisted-By: devx/3236e566-7538-432e-a30a-2bdf37265ed4

Author: samuel-williams-shopify

lib/async/container/forked.rb

@@ -111,6 +111,9 @@ def self.fork(**options)
 
 								# Reset `SignalException` delivery because CRuby inherits the `Thread.handle_interrupt` mask stack across `Thread.new`. Async deliberately masks signal exceptions, and the signal traps above should be delivered promptly:
 								::Thread.handle_interrupt(SignalException => :immediate) do
+									# Collect inherited, unreachable parent objects before user code can create a new scheduler or other descriptors which might reuse inherited descriptor numbers.
+									GC.start
+									
 									yield Instance.for(process)
 								rescue Interrupt
 									# Graceful exit.