chore(backend): bump @commitlint/config-conventional

Bumps [@commitlint/config-conventional](https://github.com/conventional-changelog/commitlint/tree/HEAD/@commitlint/config-conventional) from 19.8.1 to 20.0.0.
- [Release notes](https://github.com/conventional-changelog/commitlint/releases)
- [Changelog](https://github.com/conventional-changelog/commitlint/blob/master/@commitlint/config-conventional/CHANGELOG.md)
- [Commits](https://github.com/conventional-changelog/commitlint/commits/v20.0.0/@commitlint/config-conventional)

---
updated-dependencies:
- dependency-name: "@commitlint/config-conventional"
  dependency-version: 20.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

services/backend/package.json

@@ -47,7 +47,7 @@
   },
   "devDependencies": {
     "@commitlint/cli": "^19.8.1",
-    "@commitlint/config-conventional": "^19.8.1",
+    "@commitlint/config-conventional": "^20.0.0",
     "@eslint/js": "^9.35.0",
     "@release-it/conventional-changelog": "^10.0.1",
     "@types/better-sqlite3": "^7.6.13",