build(deps): bump @mapbox/mapbox-sdk from 0.13.7 to 0.15.6 in /example

Bumps [@mapbox/mapbox-sdk](https://github.com/mapbox/mapbox-sdk-js) from 0.13.7 to 0.15.6.
- [Release notes](https://github.com/mapbox/mapbox-sdk-js/releases)
- [Changelog](https://github.com/mapbox/mapbox-sdk-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/mapbox/mapbox-sdk-js/commits)

---
updated-dependencies:
- dependency-name: "@mapbox/mapbox-sdk"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

example/package.json

@@ -17,7 +17,7 @@
   },
   "dependencies": {
     "@mapbox/geo-viewport": "^0.5.0",
-    "@mapbox/mapbox-sdk": "^0.13.0",
+    "@mapbox/mapbox-sdk": "^0.15.6",
     "@react-native-community/masked-view": "^0.1.7",
     "@turf/along": "^6.5.0",
     "@turf/bbox-polygon": "^6.5.0",