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Make it possible to run Puma v6

Stan Hu requested to merge sh-prepare-puma-v6 into master

What does this MR do and why?

Puma v6.0 dropped nakayoshi_fork in https://github.com/puma/puma/issues/2925 since "it has very minimal gain and can trigger nasty bugs in c-extensions due to usage of GC.compact." If the call to nakayoshi_fork is made with Puma 6, the Web server will crash and fail to start up.

To avoid this, conditionally enable it only if Puma v5 is loaded.

Related merge requests:

This was split out from !119135 (merged).

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Edited by Stan Hu

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