Bump @maplibre/maplibre-gl-style-spec from 21.0.0 to 21.2.0

Bumps [@maplibre/maplibre-gl-style-spec](https://github.com/maplibre/maplibre-gl-style-spec) from 21.0.0 to 21.2.0.
- [Release notes](https://github.com/maplibre/maplibre-gl-style-spec/releases)
- [Changelog](https://github.com/maplibre/maplibre-style-spec/blob/main/CHANGELOG.md)
- [Commits](maplibre/maplibre-style-spec@v21.0.0...v21.2.0)

---
updated-dependencies:
- dependency-name: "@maplibre/maplibre-gl-style-spec"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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