MDL-80313 composer: Bump composer stuff to use php81 as minimum
It seems that in MDL-78496 we missed to regenerate the
composer stuff using the new PHP 8.1 requirement.
This commit addresses exactly that, following the instructions:
https://moodledev.io/general/development/tools/composer#how-to-prepare-and-submit-composer-changes
Note it comes with a few updated components:
- friends-of-behat/mink-extension 2.7.4
- oleg-andreyev/mink-phpwebdriver 1.3.1
And a bunch of second (and deeper) level dependencies updated too.