Bump swiftmailer/swiftmailer from 6.2.3 to 6.3.0

Bumps [swiftmailer/swiftmailer](https://github.com/swiftmailer/swiftmailer) from 6.2.3 to 6.3.0.
- [Changelog](https://github.com/swiftmailer/swiftmailer/blob/master/CHANGES)
- [Commits](swiftmailer/swiftmailer@v6.2.3...v6.3.0)

---
updated-dependencies:
- dependency-name: swiftmailer/swiftmailer
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>