Bump symfony/yaml from 6.4.0 to 6.4.3

Bumps [symfony/yaml](https://github.com/symfony/yaml) from 6.4.0 to 6.4.3.
- [Release notes](https://github.com/symfony/yaml/releases)
- [Changelog](https://github.com/symfony/yaml/blob/7.0/CHANGELOG.md)
- [Commits](symfony/yaml@v6.4.0...v6.4.3)

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

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