Update dependency nodemailer to v6.6.5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nodemailer (source)	6.6.3 -> 6.6.5

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Release Notes

nodemailer/nodemailer

### [`v6.6.5`](https://togithub.com/nodemailer/nodemailer/blob/master/CHANGELOG.md#​665-2021-09-23) [Compare Source](https://togithub.com/nodemailer/nodemailer/compare/v6.6.4...v6.6.5) - Replaced Object.values() and Array.flat() with polyfills to allow using Nodemailer in Node v6+ ### [`v6.6.4`](https://togithub.com/nodemailer/nodemailer/blob/master/CHANGELOG.md#​664-2021-09-22) [Compare Source](https://togithub.com/nodemailer/nodemailer/compare/v6.6.3...v6.6.4) - Better compatibility with IPv6-only SMTP hosts (oxzi) - Fix ses verify for sdk v3 (hannesvdvreken) - Added SECURITY.txt for contact info

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