fix(deps): update dependency nodemailer to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
nodemailer	dependencies	major	^4.3.1 -> ^5.0.0	homepage, source

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Release Notes

nodemailer/nodemailer

v5.1.1

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• Added missing option argument for custom auth

v5.1.0

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• Official support for custom authentication methods and examples (examples/custom-auth-async.js and examples/custom-auth-cb.js)

v5.0.1

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• Fixed regression error to support Node versions lower than 6.11
• Added expiremental custom authentication support

v5.0.0

Compare Source

• Start using dns.resolve() instead of dns.lookup() for resolving SMTP hostnames. Might be breaking change on some environments so upgrade with care
• Show more logs for renewing OAuth2 tokens, previously it was not possible to see what actually failed

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