Fixes composer requirements for TYPO3 10.4

[mjankiewicz]

Bug: Class 'Doctrine\Common\Cache\FilesystemCache' not found

class: \SourceBroker\T3api\Service\SerializerService uses FilesystemCache which has been removed in doctrine/cache:^2.0
From doctrine/dbal 2.13.1 doctrine/cache:^2.0 is required and throws error.

[klamparski]

Thanks @mjankiewicz for this PR. Downgrading doctrine/cache seems to be a workaround. What do you think about implementing real support of doctrine/cache:^2.0 into t3api?

btw. it's related to discussion: #37