Bump symfony/validator from 6.4.8 to 6.4.11 in /webapp

Bumps [symfony/validator](https://github.com/symfony/validator) from 6.4.8 to 6.4.11.
- [Release notes](https://github.com/symfony/validator/releases)
- [Changelog](https://github.com/symfony/validator/blob/7.1/CHANGELOG.md)
- [Commits](symfony/validator@v6.4.8...v6.4.11)

---
updated-dependencies:
- dependency-name: symfony/validator
  dependency-type: direct:production
...

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