build(deps-dev): bump eslint from 9.20.1 to 9.21.0

Bumps [eslint](https://github.com/eslint/eslint) from 9.20.1 to 9.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.20.1...v9.21.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -58,7 +58,7 @@
     "@types/node": "^22.13.4",
     "@types/nodemailer": "^6.4.17",
     "@types/rfc2047": "^2.0.3",
-    "eslint": "^9.20.1",
+    "eslint": "^9.21.0",
     "eslint-config-prettier": "^10.0.1",
     "eslint-plugin-prettier": "^5.2.3",
     "eslint-plugin-jest": "^28.11.0",