build(deps-dev): bump @commitlint/config-conventional (#965)

Bumps [@commitlint/config-conventional](https://github.com/conventional-changelog/commitlint/tree/HEAD/@commitlint/config-conventional) from 14.1.0 to 15.0.0.
- [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/v15.0.0/@commitlint/config-conventional)

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

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