Upgrade to Symfony 7.1

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (1ef06a2) to head (3e01d65).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #39 +/- ## =========================================== Coverage 100.00% 100.00% Complexity 411 411 =========================================== Files 72 72 Lines 1280 1280 =========================================== Hits 1280 1280 ``` | [Flag](https://app.codecov.io/gh/fre5h/CentrifugoBundle/pull/39/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Artem+Henvald) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/fre5h/CentrifugoBundle/pull/39/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Artem+Henvald) | `100.00% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Artem+Henvald#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.