Bump symfony/mailgun-mailer from 6.4.0 to 7.0.0

Bumps [symfony/mailgun-mailer](https://github.com/symfony/mailgun-mailer) from 6.4.0 to 7.0.0.
- [Release notes](https://github.com/symfony/mailgun-mailer/releases)
- [Changelog](https://github.com/symfony/mailgun-mailer/blob/7.0/CHANGELOG.md)
- [Commits](symfony/mailgun-mailer@v6.4.0...v7.0.0)

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

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

composer.json

@@ -36,7 +36,7 @@
         "spatie/laravel-schedule-monitor": "^3.1",
         "spatie/laravel-sitemap": "^6.2",
         "symfony/http-client": "^6.2",
-        "symfony/mailgun-mailer": "^6.2",
+        "symfony/mailgun-mailer": "^7.0",
         "yarri/link-finder": "^2.5"
     },
     "require-dev": {