Bump symfony/mailgun-mailer from 7.2.0 to 7.3.0

Bumps [symfony/mailgun-mailer](https://github.com/symfony/mailgun-mailer) from 7.2.0 to 7.3.0.
- [Release notes](https://github.com/symfony/mailgun-mailer/releases)
- [Changelog](https://github.com/symfony/mailgun-mailer/blob/7.3/CHANGELOG.md)
- [Commits](symfony/mailgun-mailer@v7.2.0...v7.3.0)

---
updated-dependencies:
- dependency-name: symfony/mailgun-mailer
  dependency-version: 7.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

composer.json

@@ -81,7 +81,7 @@
         "league/csv": "9.*",
         "spatie/enum": "^3.10",
         "symfony/http-client": "^7.2",
-        "symfony/mailgun-mailer": "^7.2",
+        "symfony/mailgun-mailer": "^7.3",
         "genkgo/camt": ">=2.10.0"
     },
     "require-dev": {