Bump symfony/mailer from 7.4.0 to 8.0.0

Bumps [symfony/mailer](https://github.com/symfony/mailer) from 7.4.0 to 8.0.0.
- [Release notes](https://github.com/symfony/mailer/releases)
- [Changelog](https://github.com/symfony/mailer/blob/7.3/CHANGELOG.md)
- [Commits](https://github.com/symfony/mailer/compare/v7.4.0...v8.0.0)

---
updated-dependencies:
- dependency-name: symfony/mailer
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

composer.json

@@ -28,7 +28,7 @@
         "symfony/flex": "^2.10.0",
         "symfony/form": "7.4.*",
         "symfony/framework-bundle": "7.4.*",
-        "symfony/mailer": "7.4.*",
+        "symfony/mailer": "8.0.*",
         "symfony/property-access": "7.4.*",
         "symfony/property-info": "7.4.*",
         "symfony/runtime": "7.4.*",