chore: bump up @types/nodemailer version to v8 (#15026)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
|
[@types/nodemailer](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/nodemailer)
([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/nodemailer))
| [`^7.0.0` →
`^8.0.0`](https://renovatebot.com/diffs/npm/@types%2fnodemailer/7.0.9/8.0.0)
|
![age](https://developer.mend.io/api/mc/badges/age/npm/@types%2fnodemailer/8.0.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@types%2fnodemailer/7.0.9/8.0.0?slim=true)
|

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packages/backend/server/package.json

@@ -127,7 +127,7 @@
     "@types/lodash-es": "^4.17.12",
     "@types/mustache": "^4.2.5",
     "@types/node": "^22.0.0",
-    "@types/nodemailer": "^7.0.0",
+    "@types/nodemailer": "^8.0.0",
     "@types/on-headers": "^1.0.3",
     "@types/react": "^19.0.1",
     "@types/semver": "^7.7.1",