Bump symfony/messenger from 6.4.16 to 6.4.19

Bumps [symfony/messenger](https://github.com/symfony/messenger) from 6.4.16 to 6.4.19.
- [Release notes](https://github.com/symfony/messenger/releases)
- [Changelog](https://github.com/symfony/messenger/blob/7.2/CHANGELOG.md)
- [Commits](symfony/messenger@v6.4.16...v6.4.19)

---
updated-dependencies:
- dependency-name: symfony/messenger
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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