Bump phpmailer/phpmailer from 5.2.2 to 6.9.2

Bumps [phpmailer/phpmailer](https://github.com/PHPMailer/PHPMailer) from 5.2.2 to 6.9.2.
- [Release notes](https://github.com/PHPMailer/PHPMailer/releases)
- [Changelog](https://github.com/PHPMailer/PHPMailer/blob/master/changelog.md)
- [Commits](PHPMailer/PHPMailer@v5.2.2...v6.9.2)

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

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

composer.json

@@ -1,5 +1,5 @@
 {
     "require": {
-        "phpmailer/phpmailer": "5.2.2"
+        "phpmailer/phpmailer": "6.9.2"
     }
 }