Re-add support for ActiveSupport 7.0.8

What does this MR do and why?

Support for ActiveSupport 7.0.8 was broken by !162 (diffs, comment 1920148440), and explicitely removed by !198 (diffs).

This is a problem as the monolith is still depending on gem 'rails', '~> 7.0.8.1'.

This MR re-add support for ActiveSupport < 7.1.

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