Bump mapbox-gl from 1.3.1 to 1.6.1
Bump mapbox-gl from 1.3.1 to 1.6.1

Bumps [mapbox-gl](https://github.com/mapbox/mapbox-gl-js) from 1.3.1 to 1.6.1.
- [Release notes](https://github.com/mapbox/mapbox-gl-js/releases)
- [Changelog](https://github.com/mapbox/mapbox-gl-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mapbox/mapbox-gl-js/compare/v1.3.1...v1.6.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
SuperMap/iClient9,SuperMap/iClient9