Bump nodemailer from 6.4.8 to 6.6.0 (#153)

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.4.8 to 6.6.0.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.4.8...v6.6.0)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>