build(deps): bump stylelint-config-twbs-bootstrap from 14.2.0 to 15.0.0

Bumps [stylelint-config-twbs-bootstrap](https://github.com/twbs/stylelint-config-twbs-bootstrap) from 14.2.0 to 15.0.0.
- [Release notes](https://github.com/twbs/stylelint-config-twbs-bootstrap/releases)
- [Commits](twbs/stylelint-config-twbs-bootstrap@v14.2.0...v15.0.0)

---
updated-dependencies:
- dependency-name: stylelint-config-twbs-bootstrap
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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