Php8.4 support

[SRWieZ]

Fixes #1423

• Added thecodingmachine/safe ^3.0 support
• Bumbed symfony/process to 6.4.14 and 7.1.7 to pass CVE-2024-51736
• Added 8.4 in tests and e2e tests

[SRWieZ]

Hi, this is my first time contributing to this project, so please excuse any mistakes.

I did my best to ensure the tests pass, but there is a lot going on, and some things seem unrelated.

I noticed that thecodingmachine/safe tagged version 3.0, which addresses many deprecation notices, so I decided to give it a try.

Based on my results, we still need to support version 3.0 in your other packages:

➜  fork-box git:(php8.4-support) ✗ composer why thecodingmachine/safe
humbug/box        4.x-dev requires thecodingmachine/safe (^2.5 || ^3.0)
fidry/console     0.6.10  requires thecodingmachine/safe (^2.0)
fidry/filesystem  1.2.1   requires thecodingmachine/safe (^2.0)
fidry/makefile    1.0.2   requires thecodingmachine/safe (^2.0)
humbug/php-scoper 0.18.16 requires thecodingmachine/safe (^2.0)

If I'm on the right path, I can make a PR to the other four projects.

Thanks in advance for any feedback.

[theofidry]

Thanks for the PR! I'll have a closer look this weekend unfortunately the last weeks have been very busy