Update dependency nodemailer to v6.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nodemailer (source)	6.5.0 -> 6.6.0

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Release Notes

nodemailer/nodemailer

### [`v6.6.0`](https://togithub.com/nodemailer/nodemailer/blob/master/CHANGELOG.md#​660-2021-04-28) [Compare Source](https://togithub.com/nodemailer/nodemailer/compare/v6.5.0...v6.6.0) - Added new option `newline` for MailComposer - aws ses connection verification (Ognjen Jevremovic)

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