Bump nodemailer from 6.9.1 to 6.9.3

Bumps nodemailer from 6.9.1 to 6.9.3.

Changelog

Sourced from nodemailer's changelog.

6.9.3 2023-05-29

• Specified license identifier (was defined as MIT, actual value MIT-0)
• If SMTP server disconnects with a message, process it and include as part of the response error

6.9.2 2023-05-11

• Fix uncaught exception on invalid attachment content payload

Commits

• 551c7b6 v6.9.3
• 5f81de4 specified license identifier
• 5ff8625 Update README.md
• 9222298 Merge branch 'master' of github.com:nodemailer/nodemailer
• 707f2b1 Process last message from server
• c77d70f feat: added https://forwardemail.net to well-known services
• 19fce2d v6.9.2
• See full diff in compare view

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