build(deps): Bump symfony/process in /fixtures/set020-infection

Bumps [symfony/process](https://github.com/symfony/process) from 5.4.3 to 6.4.31.
- [Release notes](https://github.com/symfony/process/releases)
- [Changelog](https://github.com/symfony/process/blob/8.1/CHANGELOG.md)
- [Commits](symfony/process@v5.4.3...v6.4.31)

---
updated-dependencies:
- dependency-name: symfony/process
  dependency-version: 6.4.31
  dependency-type: indirect
...

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Author: dependabot[bot]