fix(deps): update dependency phpmailer/phpmailer to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
phpmailer/phpmailer	6.12.0 → 7.0.2

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Release Notes

PHPMailer/PHPMailer (phpmailer/phpmailer)

v7.0.2

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• Fixes for sendmail parameter problems in WordPress, thanks to @​SirLouen
• Reduce memory consumption when sending large attachments by @​RobinvanderVliet

v7.0.1

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• 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.

v7.0.0

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This is exactly the same as 6.11.1 but bumps the major version number to indicate the presence of a BC break in child classes. Specifically, lang(), setLanguage(), and $language are now static, and should be called statically.

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