Bump ol-mapbox-style from 12.3.5 to 12.4.0

Bumps [ol-mapbox-style](https://github.com/openlayers/ol-mapbox-style) from 12.3.5 to 12.4.0.
- [Release notes](https://github.com/openlayers/ol-mapbox-style/releases)
- [Changelog](https://github.com/openlayers/ol-mapbox-style/blob/main/CHANGELOG.md)
- [Commits](openlayers/ol-mapbox-style@v12.3.5...v12.4.0)

---
updated-dependencies:
- dependency-name: ol-mapbox-style
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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