WEB-1642: Unlock Puma 7

[codersquirrelbln]

@bmedenwald, one thing I am curious about is how the prefix tests/ gets created in [tests / tests (3.2.9) (pull_request)]... Do you have an idea or does it not really matter?

Multiple gems that were integrated as a default in ruby have been extracted and now need to be included directly.
From our test runs: bigdecimal was loaded from the standard library, but is not part of the default gems starting from Ruby 3.4.0. and mutex_m was loaded from the standard library, but is not part of the default gems starting from Ruby 3.4.0. Source

• bigdecimal
• mutex-m
• ruby 4 needed an upgraded version of bundler. Source
  From our test run:

Because the current Bundler version (4.0.3) does not satisfy bundler ~> 2.0
  and Gemfile depends on bundler ~> 2.0,
  version solving has failed.

Oriented myself on this PR: scheduler

[codersquirrelbln]

Above addressing comments.
Below additional commit to update rails dependency