chore(backend): bump @commitlint/cli in /services/backend

Bumps [@commitlint/cli](https://github.com/conventional-changelog/commitlint/tree/HEAD/@commitlint/cli) from 20.5.3 to 21.0.0.
- [Release notes](https://github.com/conventional-changelog/commitlint/releases)
- [Changelog](https://github.com/conventional-changelog/commitlint/blob/master/@commitlint/cli/CHANGELOG.md)
- [Commits](https://github.com/conventional-changelog/commitlint/commits/v21.0.0/@commitlint/cli)

---
updated-dependencies:
- dependency-name: "@commitlint/cli"
  dependency-version: 21.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

services/backend/package.json

@@ -52,7 +52,7 @@
     "zod-openapi": "^5.4.6"
   },
   "devDependencies": {
-    "@commitlint/cli": "^20.4.3",
+    "@commitlint/cli": "^21.0.0",
     "@commitlint/config-conventional": "^20.4.1",
     "@eslint/js": "^10.0.1",
     "@release-it/conventional-changelog": "^10.0.5",