Add support for Symfony Process 8

[renatonascalves]

Hi! Thanks for maintaining this package. I have a suggestion.

Problem

wpelevator/run-parallel v2.0.0 currently requires:

"symfony/process": "^6.4 || ^7.0"

Our project previously used Symfony Process v8.1.0 through ParaTest. ParaTest supports both Symfony Process 7 and 8.

After installing wpelevator/run-parallel, Composer downgraded Symfony Process from v8.1.0 to v7.4.13 because version 8 is outside the package's declared constraint.

Composer reports:

wpelevator/run-parallel v2.0.0 requires symfony/process (^6.4 || ^7.0)

Request

Could the package be tested with Symfony Process 8 and, if compatible, update the constraint to:

"symfony/process": "^6.4 || ^7.0 || ^8.0"

This would allow projects already using Symfony Process 8 to install run-parallel without a downgrade.

Environment

• wpelevator/run-parallel: v2.0.0
• PHP: 8.4
• Previous symfony/process: v8.1.0
• Selected after installation: v7.4.13