chore(deps): bump symfony/http-client in /plugins/roadrunner/examples

Bumps [symfony/http-client](https://github.com/symfony/http-client) from 6.1.2 to 6.4.19.
- [Release notes](https://github.com/symfony/http-client/releases)
- [Changelog](https://github.com/symfony/http-client/blob/7.3/CHANGELOG.md)
- [Commits](symfony/http-client@v6.1.2...v6.4.19)

---
updated-dependencies:
- dependency-name: symfony/http-client
  dependency-version: 6.4.19
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]