fix(deps): update dependency phpmailer/phpmailer to v6.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
phpmailer/phpmailer	6.10.0 → 6.12.0

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Release Notes

PHPMailer/PHPMailer (phpmailer/phpmailer)

v6.12.0

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This is exactly the same as 6.10.0, reverting all the changes in 6.11.0 and 6.11.1, which inadvertently introduced a BC break affecting child classes. 6.11.1 has been re-released as 7.0.0.

v6.11.1

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• Avoid function signature problems with the deprecation of $useimap in parseAddresses.

v6.11.0

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• Add support for RFC4954 two-part authentication for large XOAUTH2 tokens.
• Also support empty tokens.
• Avoid bogus static analyser deprecation warnings in setFrom.
• Make language loading entirely static, thanks to @​SirLouen.
• Emit warnings when parseAddresses() is used without the IMAP extension.
• Handle mb_decode_mimeheader changes from PHP 8.3+.
• Deprecate the charset param to parseAddresses.
• Fix PHP 8.5 linting issue.
• Don't use -t switch when calling qmail.
• Checking for interrupted system calls now works in languages other than English.
• Add support for extracting gmail transaction IDs after sending.
• For consistency, the protected ReplyTo property has been changed to match the format used for other address arrays.
• Fix line length issues when using S/MIME signing.
• Pin action runners to exact versions to avoid unexpected upstream changes.

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