Bump symfony/filesystem from 5.4.9 to 5.4.21

Bumps [symfony/filesystem](https://github.com/symfony/filesystem) from 5.4.9 to 5.4.21.
- [Release notes](https://github.com/symfony/filesystem/releases)
- [Changelog](https://github.com/symfony/filesystem/blob/6.2/CHANGELOG.md)
- [Commits](symfony/filesystem@v5.4.9...v5.4.21)

---
updated-dependencies:
- dependency-name: symfony/filesystem
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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