Merge pull request #47 from OpenConext/feature/update

Make Symfony 7.4 compatible

Upgrade code quality a notch

Return null when gssp attributes not found

Previously a NotFound exception was thrown. But our type definition
advertises we should return null in that case.

Stop running tests on PHP8.1

Bump Symfony 6 version restraints to 6.4

Initialize the session just in time

When running the session value store in a context without a session in
the request stack (cache warmup) the session is not available. And a big
crash is the result. By loading the session JIT. That issue should be
resolved

Reset annotation imports

Remove annotation imports

Remove annotation imports

Update CHANGELOG

And put money where mouth is