[BC Break] Add support for Symfony 6 (from @Slamdunk) #418
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Fixes #416 #413
The isolated BC breaks in this PR are as follows:
These BC breaks are necessary to prevent upstream Symfony BC breaks leaking into our own API. I did NOT mark these classes as final (although ideally they should be, perhaps we can do that in a future release), but this means we will no longer support BC in any of these classes. Downstream consumers should not extend these
@internal
classes any more, and will receive an error if they are extending them in turn and using Roave/BackwardsCompatibilityCheck.