chore(deps): update dependency @types/nodemailer to v6.4.18 (#390)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[@types/nodemailer](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/nodemailer)
([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/nodemailer))
| [`6.4.17` ->
`6.4.18`](https://renovatebot.com/diffs/npm/@types%2fnodemailer/6.4.17/6.4.18)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@types%2fnodemailer/6.4.18?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@types%2fnodemailer/6.4.17/6.4.18?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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