[tests-only] Use PHP 7.4 for behat acceptance test dependencies #38066
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Description
See the issue for details of the problem. Summary: with composer 2.0, behat gets errors when trying to load its dependencies with PHP 7.2 and 7.3. It works OK with PHP 7.4
This works-around the problem. There is likely some dependency of behat that needs to have something sorted out for composer 2.0 and PHP 7.2/7.3. But actually we don't really care about that!
Related Issue
Fixes #38067
How Has This Been Tested?
CI
Types of changes
Checklist: