mail/phpmailer7: Update to 7.0.1

-Use From domain when generating CIDs in msgHTML.
-Update to PHPCompatibility 10, resolve numerous PHPCS issues in PHP 8.5.
-Revise GitHub actions for PHP 8.5 and experimental 8.6 tests.
-Switch gmail example from the deprecated IMAP extension to use
directorytree/imapengine for IMAP uploads.
-Set htmlspecialchars() flags explicitly and consistently.
-Convert XOAUTH2 token exceptions into PHPMailer Exceptions. The original
exception is available as an inner exception.
-Deprecate VERSION constants in POP3 and SMTP classes.
-Remove dependency on roave/security-advisories; it's now built into composer 2.9.
-Update Dutch, Esperanto, and Norwegian translations.

Sponsored by: Netzkommune GmbH