Bump symfony/mailer from 7.4.8 to 7.4.12

Bumps [symfony/mailer](https://github.com/symfony/mailer) from 7.4.8 to 7.4.12.
- [Release notes](https://github.com/symfony/mailer/releases)
- [Changelog](https://github.com/symfony/mailer/blob/8.1/CHANGELOG.md)
- [Commits](symfony/mailer@v7.4.8...v7.4.12)

---
updated-dependencies:
- dependency-name: symfony/mailer
  dependency-version: 7.4.12
  dependency-type: indirect
...

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Author: dependabot[bot]