chore: bump up nodemailer version to v7 (#12124)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [nodemailer](https://nodemailer.com/) ([source](https://redirect.github.com/nodemailer/nodemailer)) | [`^6.9.16` -> `^7.0.0`](https://renovatebot.com/diffs/npm/nodemailer/6.10.1/7.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/nodemailer/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/nodemailer/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/nodemailer/6.10.1/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/nodemailer/6.10.1/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v7.0.0`](https://redirect.github.com/nodemailer/nodemailer/blob/HEAD/CHANGELOG.md#700-2025-05-03)

[Compare Source](https://redirect.github.com/nodemailer/nodemailer/compare/v6.10.1...v7.0.0)

##### ⚠ BREAKING CHANGES

-   SESv2 SDK support, removed older SES SDK v2 and v3 , removed SES rate limiting and idling features

##### Features

-   SESv2 SDK support, removed older SES SDK v2 and v3 , removed SES rate limiting and idling features ([15db667](15db667af2))

</details>

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packages/backend/server/package.json

@@ -99,7 +99,7 @@
     "nest-commander": "^3.15.0",
     "nest-winston": "^1.9.7",
     "nestjs-cls": "^5.0.0",
-    "nodemailer": "^6.9.16",
+    "nodemailer": "^7.0.0",
     "on-headers": "^1.0.2",
     "piscina": "^5.0.0-alpha.0",
     "prisma": "^6.6.0",