Breaking: #97752 - MailerAdapterInterface removed

See forge#97752

Description

The \TYPO3\CMS\Core\Mail\MailerAdapterInterface has been removed, since the interface became unused in v7 due to removal of Core's SwiftMailerAdapter implementation, which had been used as hook subscriber in the also removed MailUtility::mail() method.

Impact

Implementing the interface in custom extension code will trigger a PHP Error.

Affected installations

All installations implementing the interface in custom extension code, which is very unlikely. The extension scanner will report any usage as strong match.

Migration

Remove any usage of the interface in extension code.