Update dependency nodemailer to v7.0.6 (#312)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [nodemailer](https://nodemailer.com/)
([source](https://redirect.github.com/nodemailer/nodemailer)) | [`7.0.5`
-> `7.0.6`](https://renovatebot.com/diffs/npm/nodemailer/7.0.5/7.0.6) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/nodemailer/7.0.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/nodemailer/7.0.5/7.0.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v7.0.6`](https://redirect.github.com/nodemailer/nodemailer/blob/HEAD/CHANGELOG.md#706-2025-08-27)

[Compare
Source](https://redirect.github.com/nodemailer/nodemailer/compare/v7.0.5...v7.0.6)

##### Bug Fixes

- **encoder:** avoid silent data loss by properly flushing trailing
base64
([#&#8203;1747](https://redirect.github.com/nodemailer/nodemailer/issues/1747))
([01ae76f](https://redirect.github.com/nodemailer/nodemailer/commit/01ae76f2cfe991c0c3fe80170f236da60531496b))
- handle multiple XOAUTH2 token requests correctly
([#&#8203;1754](https://redirect.github.com/nodemailer/nodemailer/issues/1754))
([dbe0028](https://redirect.github.com/nodemailer/nodemailer/commit/dbe00286351cddf012726a41a96ae613d30a34ee))
- ReDoS vulnerability in parseDataURI and \_processDataUrl
([#&#8203;1755](https://redirect.github.com/nodemailer/nodemailer/issues/1755))
([90b3e24](https://redirect.github.com/nodemailer/nodemailer/commit/90b3e24d23929ebf9f4e16261049b40ee4055a39))

</details>

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