Composer(deps): Bump symfony/mailer from 6.2.7 to 6.2.8 in /web

Bumps [symfony/mailer](https://github.com/symfony/mailer) from 6.2.7 to 6.2.8.
- [Release notes](https://github.com/symfony/mailer/releases)
- [Changelog](https://github.com/symfony/mailer/blob/6.2/CHANGELOG.md)
- [Commits](symfony/mailer@v6.2.7...v6.2.8)

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

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

Author: dependabot[bot]