[Snyk] Security upgrade nodemailer from 4.7.0 to 6.4.16

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	823/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 8.6	Command Injection SNYK-JS-NODEMAILER-1038834	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: nodemailer

The new version differs by 83 commits.

• ba31c64 v6.4.16
• 7e7b2b2 v6.4.15
• fca2041 Update CHANGELOG.md
• b4ccfa3 Oups
• 24b93bf Add ethereal.email to well-known/services.json
• 0f132fa doc: make the code a little more accessible with some code comments.
• 1815bad v6.4.14
• dd26ddd v6.4.13
• 455cfbe v6.4.12
• 1787f22 Includes all information from the oath2 error response in the error message (#1191)
• e3055c4 v6.4.11
• 3cfbf60 Create pull_request_template.md
• 35f9e33 Create CODE_OF_CONDUCT.md
• 8985bde v6.4.10
• a0cab71 v6.4.8
• 5874437 Updated testable node versions
• 643c039 v6.4.7
• b039ca5 Force charset for Content-Type headers even if not needed
• 5702a71 catch errors from invalid crypto.sign
• 5e00fb5 Update issue templates
• c32431d Delete ISSUE_TEMPLATE.md
• c034548 v6.4.6
• 3bfc545 fix: `requeueAttempts=n` should requeue `n` times
• c73bb33 v6.4.5

See the full diff

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