chore(deps-dev): bump @commitlint/config-conventional

Bumps [@commitlint/config-conventional](https://github.com/conventional-changelog/commitlint/tree/HEAD/@commitlint/config-conventional) from 8.3.6 to 19.6.0.
- [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/v19.6.0/@commitlint/config-conventional)

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

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

package.json

@@ -52,7 +52,7 @@
   },
   "devDependencies": {
     "@commitlint/cli": "^8.0.0",
-    "@commitlint/config-conventional": "^8.0.0",
+    "@commitlint/config-conventional": "^19.6.0",
     "@types/chai": "^4.0.0",
     "@types/cross-spawn": "^6.0.0",
     "@types/mocha": "^7.0.0",