Use Concurrent.available_processor_count instead of Concurrent.usable_processor_count (#2358)

Author: heka1024

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Features
 
+- Use `Concurrent.available_processor_count` instead of `Concurrent.usable_processor_count` ([#2358](https://github.com/getsentry/sentry-ruby/pull/2358))
+
 - Support for tracing Faraday requests ([#2345](https://github.com/getsentry/sentry-ruby/pull/2345))
   - Closes [#1795](https://github.com/getsentry/sentry-ruby/issues/1795)
   - Please note that the Faraday instrumentation has some limitations in case of async requests: https://github.com/lostisland/faraday/issues/1381

sentry-ruby/lib/sentry/configuration.rb

@@ -656,11 +656,8 @@ def run_post_initialization_callbacks
     end
 
     def processor_count
-      if Concurrent.respond_to?(:usable_processor_count)
-        Concurrent.usable_processor_count
-      else
-        Concurrent.processor_count
-      end
+      available_processor_count = Concurrent.available_processor_count if Concurrent.respond_to?(:available_processor_count)
+      available_processor_count || Concurrent.processor_count
     end
   end
 end