build(deps-dev): bump ol-layerswitcher from 4.1.1 to 4.1.2

Bumps [ol-layerswitcher](https://github.com/walkermatt/ol-layerswitcher) from 4.1.1 to 4.1.2.
- [Changelog](https://github.com/walkermatt/ol-layerswitcher/blob/master/CHANGELOG.md)
- [Commits](walkermatt/ol-layerswitcher@v4.1.1...v4.1.2)

---
updated-dependencies:
- dependency-name: ol-layerswitcher
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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