Update dependency phpmailer/phpmailer to v6.6.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
phpmailer/phpmailer	require	patch	6.6.4 -> 6.6.5

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Release Notes

PHPMailer/PHPMailer

v6.6.5

Compare Source

• Don't try to issue RSET if there has been a connection error
• Reject attempts to add folders as attachments
• Don't suppress earlier error messages on close()
• Handle Host === null better
• Update Danish and Polish translations
• Change recommendation for Microsoft OAuth package to thenetworg/oauth2-azure
• Bump some GitHub action versions

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