Bump symfony/string from 5.4.39 to 5.4.40

Bumps [symfony/string](https://github.com/symfony/string) from 5.4.39 to 5.4.40.
- [Release notes](https://github.com/symfony/string/releases)
- [Changelog](https://github.com/symfony/string/blob/7.1/CHANGELOG.md)
- [Commits](symfony/string@v5.4.39...v5.4.40)

---
updated-dependencies:
- dependency-name: symfony/string
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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