Php8

[W0rma]

Closes #94

[W0rma]

@goetas I'm a bit lost when it comes to fixing the tests.

Tests are green if I use jms/serializer-bundle:3.6 but they start failing if I use jms/serializer-bundle:3.7 or higher. Seems like this is related to the changes in schmittjoh/JMSSerializerBundle#803. However I have no clue how to get tests working again. Can you provide some hints?

[tjveldhuizen]

I tried to debug this for some hours, last week, however I didn't manage to find a solution. It would be nice if we can find a way to fix it, though. This bundle seems to be the last one blocking our upgrade to PHP 8.

Appearantly, in some way the constructor for the metadata_driver-dependency does end up as a class, rather than a callable, which results in a "Function name must be a string" error in \Bazinga\Bundle\HateoasBundle\Tests\DependencyInjection\BazingaHateoasExtensionTest::testLoad. I'm not sure if this is a problem in the test setup, in the code of this bundle, or in the serializer. Maybe somebody has a clue about that?

[tjveldhuizen]

The problem seems to be unrelated tot this specific PR, since it also exists in the current 2.1.0-version of this bundle. It is related to a specific version of the JMS/metadata-package: https://github.com/schmittjoh/metadata/releases/tag/2.3.0, so merged PR schmittjoh/metadata#92.