Bump symfony/stimulus-bundle from 2.27.0 to 2.28.1 in /web/landing

Bumps [symfony/stimulus-bundle](https://github.com/symfony/stimulus-bundle) from 2.27.0 to 2.28.1.
- [Changelog](https://github.com/symfony/stimulus-bundle/blob/2.x/CHANGELOG.md)
- [Commits](symfony/stimulus-bundle@v2.27.0...v2.28.1)

---
updated-dependencies:
- dependency-name: symfony/stimulus-bundle
  dependency-version: 2.28.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]