Fix various warnings across components test suite #54824
Merged
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We found out with @xabbuh that some warnings are "hidden" in the test suite of 5.4. Indeed, a risky test was raised in upper branches (starting from 6.4). However, this test was not marked as risky in the 5.4 branch. The reproducer is straightforward:
vendor/bin/phpunit src/Symfony/Component/Serializer
marked the test as risky../phpunit src/Symfony/Component/Serializer
did not mark the test as risky.I went through components and bundle and executed PHPUnit to fix various warnings and deprecations hidden in the 5.4 CI. We don't know yet why 5.4 behaves this way. In the meantime, here are a few fixes of deprecated behaviors I found.