fix comparison type issue in puma.rb template (rails#46874)

* fix comparison type issue in puma.rb template

* Ensure integer

Co-authored-by: David Heinemeier Hansson <[email protected]>

Author: gregmolnar

railties/lib/rails/generators/rails/app/templates/config/puma.rb.tt

@@ -13,7 +13,7 @@ threads min_threads_count, max_threads_count
 
 # Specifies that the worker count should equal the number of processors in production.
 if ENV["RAILS_ENV"] == "production"
-  worker_count = ENV.fetch("WEB_CONCURRENCY") { Concurrent.physical_processor_count }
+  worker_count = Integer(ENV.fetch("WEB_CONCURRENCY") { Concurrent.physical_processor_count })
   workers worker_count if worker_count > 1
 end