Remove swiftmailer from dependencies

Removing theme hooks for swift and install requirement.

Thanks, Edgar, for reporting and patching

I agree to do that in the 9.1.x branch.
Better to completely ditche swiftmailer in composer and default config

Testing, and changing the default configs to Symfony Mailer

✅ Released varbase_email-9.1.2 →

Automatically closed - issue fixed for 2 weeks with no activity.

✅ Released varbase-9.1.2 →