feat: support symfony 7

[Chris53897]

#552

Except from "symfony/dependency-injection": "^4.4 || ^5.4 || ^6.4",
This needs more work.

omnipay-common does not yet support symfony 7.
thephpleague/omnipay-common#264

[cyraid]

Now that you updated Omnipay, how does it look for some Symfony 7 support? :)

[Chris53897]

It did a copy of the branch and it did work in production.
https://github.com/Chris53897/PayumBundle/tree/feature/support-symfony-7-srt

To make it stable for the ci, and safe to merge, it would be great to have a new release of https://github.com/thephpleague/omnipay-common
Update: Release is now available

[Chris53897]

Now there is an installable set in the CI.

@pierredup It would be great if you can have a look and tell me which steps (and order) should we take to have full symfony 7 support.

[pierredup]

Thanks @Chris53897!