Update ActiveSupport cache_format_version to 7.1

Marco Gregoriusrequested to merge
mg/active-support-cache-format-version into master

What does this MR do and why?

Update cache_format_version in ActiveSupport to remove deprecation warning:

DEPRECATION WARNING: Support for `config.active_support.cache_format_version = 6.1` has been deprecated and will be removed in Rails 7.2.

More context can be found in #516144 (closed).

Resolves #538001 (closed) and #516144 (closed)

References

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Before After

How to set up and validate locally

Since this also concerns sessions, we should test sessions can be read between both branches.

  1. On master, log in as a user
  2. Check out to this branch
  3. Restart Rails (restart is required since session store is initialized in initializer)
  4. Refresh browser.
  5. Log out, log in again.
  6. Checkout master branch, restart Rails
  7. Refresh browser.

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Edited by Marco Gregorius

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