add symfony7 support

[dozer111]

No description provided.

[wjzijderveld]

Maybe a weird question: but is there a reason you'd still want to use this with Symfony 7?
Symfony has had built-in support for this for a while now: $request->getPayload()->get('foo')
See #65

[dozer111]

yes, you are right. I don`t know about it

thank you

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also i see that u would write about it in readme. This is better solutuion)