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",

yarn.lock

@@ -983,7 +983,7 @@ __metadata:
     "@types/lodash-es": "npm:^4.17.12"
     "@types/mustache": "npm:^4.2.5"
     "@types/node": "npm:^22.0.0"
-    "@types/nodemailer": "npm:^7.0.0"
+    "@types/nodemailer": "npm:^8.0.0"
     "@types/on-headers": "npm:^1.0.3"
     "@types/react": "npm:^19.0.1"
     "@types/semver": "npm:^7.7.1"
@@ -16873,12 +16873,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/nodemailer@npm:^7.0.0":
-  version: 7.0.9
-  resolution: "@types/nodemailer@npm:7.0.9"
+"@types/nodemailer@npm:^8.0.0":
+  version: 8.0.0
+  resolution: "@types/nodemailer@npm:8.0.0"
   dependencies:
     "@types/node": "npm:*"
-  checksum: 10/6bfca388af668a05a68e750a7acbd5736a3dcdf96f34f23bf4211ab152572d55008fd813e38bf03f944c6edbd002a7f98d6cee048343b8e840b3b91a00befac9
+  checksum: 10/d1178b557e8c547018e708459af06fdf2e9cfd6d65fed109517cddfe6b5add6201d941882a2e4eeede529de08ae71a68fb2a1d8f1c41cb3761d3a6c2458025fe
   languageName: node
   linkType: hard