Build(deps): bump symfony/serializer from 7.1.8 to 7.1.9

Bumps [symfony/serializer](https://github.com/symfony/serializer) from 7.1.8 to 7.1.9.
- [Release notes](https://github.com/symfony/serializer/releases)
- [Changelog](https://github.com/symfony/serializer/blob/7.1/CHANGELOG.md)
- [Commits](symfony/serializer@v7.1.8...v7.1.9)

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

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

Author: dependabot[bot]