Update dependency nodemailer to v6.9.15 (#147)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [nodemailer](https://nodemailer.com/)
([source](https://redirect.github.com/nodemailer/nodemailer)) |
[`6.9.14` ->
`6.9.15`](https://renovatebot.com/diffs/npm/nodemailer/6.9.14/6.9.15) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/nodemailer/6.9.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/nodemailer/6.9.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/nodemailer/6.9.14/6.9.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/nodemailer/6.9.14/6.9.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>nodemailer/nodemailer (nodemailer)</summary>

###
[`v6.9.15`](https://redirect.github.com/nodemailer/nodemailer/blob/HEAD/CHANGELOG.md#6915-2024-08-08)

[Compare
Source](https://redirect.github.com/nodemailer/nodemailer/compare/v6.9.14...v6.9.15)

##### Bug Fixes

- Fix memory leak
([#&#8203;1667](https://redirect.github.com/nodemailer/nodemailer/issues/1667))
([baa28f6](https://redirect.github.com/nodemailer/nodemailer/commit/baa28f659641a4bc30360633673d851618f8e8bd))
- **mime:** Added GeoJSON closes
[#&#8203;1637](https://redirect.github.com/nodemailer/nodemailer/issues/1637)
([#&#8203;1665](https://redirect.github.com/nodemailer/nodemailer/issues/1665))
([79b8293](https://redirect.github.com/nodemailer/nodemailer/commit/79b8293ad557d36f066b4675e649dd80362fd45b))

</details>

---

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Author: LUISDASARTIMANHAS