Use Concurrent.usable_processor_count when it is available #2339
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It's a new API introduced in concurrent-ruby 1.3.1, which works better in the container environment.
ruby-concurrency/concurrent-ruby#1038
Since there are gems like sorbet-runtime that still use older versions of concurrent-ruby, we can't directly bump concurrent-ruby's requirement, but need to check if the method is available before calling it.
Big thanks to @trevorturk for proposing this idea.