build(deps-dev): bump symfony/process in /examples/docker-swarm-php (#1735)

Bumps [symfony/process](https://github.com/symfony/process) from 5.4.46 to 5.4.51.
- [Release notes](https://github.com/symfony/process/releases)
- [Changelog](https://github.com/symfony/process/blob/8.1/CHANGELOG.md)
- [Commits](symfony/process@v5.4.46...v5.4.51)

---
updated-dependencies:
- dependency-name: symfony/process
  dependency-version: 5.4.51
  dependency-type: indirect
...

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