Bump symfony/process in /tests/Composer/__fixtures__

Bumps [symfony/process](https://github.com/symfony/process) from 6.4.26 to 8.0.5.
- [Release notes](https://github.com/symfony/process/releases)
- [Changelog](https://github.com/symfony/process/blob/8.1/CHANGELOG.md)
- [Commits](symfony/process@v6.4.26...v8.0.5)

---
updated-dependencies:
- dependency-name: symfony/process
  dependency-version: 8.0.5
  dependency-type: indirect
...

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Author: dependabot[bot]