Bump rgeo-geojson from 2.0.0 to 2.1.1 in /backend
Bump rgeo-geojson from 2.0.0 to 2.1.1 in /backend

Bumps [rgeo-geojson](https://github.com/rgeo/rgeo-geojson) from 2.0.0 to 2.1.1.
- [Release notes](https://github.com/rgeo/rgeo-geojson/releases)
- [Changelog](https://github.com/rgeo/rgeo-geojson/blob/master/History.md)
- [Commits](https://github.com/rgeo/rgeo-geojson/compare/v2.0.0...v2.1.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
roschaefer/rundfunk-mitbestimmen,roschaefer/rundfunk-mitbestimmen,roschaefer/rundfunk-mitbestimmen