chore(deps): Bump symfony/mailer from 5.4.22 to 6.4.8

Bumps [symfony/mailer](https://github.com/symfony/mailer) from 5.4.22 to 6.4.8.
- [Release notes](https://github.com/symfony/mailer/releases)
- [Changelog](https://github.com/symfony/mailer/blob/7.1/CHANGELOG.md)
- [Commits](symfony/mailer@v5.4.22...v6.4.8)

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

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

composer.json

@@ -51,7 +51,7 @@
 		"symfony/console": "^5.4.24",
 		"symfony/event-dispatcher": "^5.4.26",
 		"symfony/http-foundation": "^5.4.24",
-		"symfony/mailer": "^5.4.22",
+		"symfony/mailer": "^6.4.8",
 		"symfony/polyfill-intl-grapheme": "^1.28",
 		"symfony/polyfill-intl-normalizer": "^1.28",
 		"symfony/process": "^5.4.34",