Upgrade to php 8.2

[baszoetekouw]

[johanib]

When running the behat tests and logging deprecation messages triggerd through the behat tests, this line occurs 1.333.021 times:
mb_strpos(): Passing null to parameter #3 ($offset) of type int is deprecated|/var/www/html/vendor/beberlei/assert/lib/Assert/Assertion.php:873.

This might be solved by upgrading to the latest 3.x version.
However, this is held back by the https://github.com/OpenConext/SamlValueObject/tree/feature/support-php-82 library, which seems to have a never released 8.2 compatible branch.
But also, it needs to have it's constrains loosened, as it requires beberlei/assert < 3.

Update: Resolved, SamlValueObject has been upgraded to be php 8.4 compatible & the latest assertion library.