[Snyk] Security upgrade nodemailer from 2.3.0 to 4.0.1

[fengmk2]

This PR was automatically created by Snyk using the credentials of a real user.

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 | Server-side Request Forgery (SSRF)
[SNYK-JS-IP-6240864](https://snyk.io/vuln/SNYK-JS-IP-6240864) | 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 88 commits.

• 8b5990c v4.0.1
• f09556f Fixed LMTP greeting for STARTTLS
• 935d26f Merge branch 'master' of github.com:nodemailer/nodemailer
• fe919ab v4.0.0
• aa61bc2 Update ISSUE_TEMPLATE.md
• 9b4f90a v3.1.8. Fixed List-* headers
• c2d6d41 v3.1.7
• 86f2b86 v3.1.6
• f2389b9 v3.1.5
• e25807e added mailosaur wo well-known services
• 3065a64 v3.1.4
• f5edfc9 Fixed DKIM calculation for empty body
• ef202df v3.1.3
• 4397e7f Added .verify() method for SES. Tries to send mail to invalid address
• 0097988 v3.1.2
• cca3b8c Add error handling for SES and sendmail tranports for failing messages
• 315eb22 v3.1.1
• aba7bd6 Added missing transport.on('idle') and transport.isIdle() for SES transports
• 689f834 v3.1.0
• 3c3d920 Supress Message-ID and Date in DKIM headers when using SES
• 8819548 updated message-id handling for SES
• 645dd95 Merge branch 'master' of github.com:nodemailer/nodemailer
• 5cadb3f Initial support for SES
• 1ceab54 Added some missing tests for icalEvent

See the full diff

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