octomap: 1.6.8-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `octomap` to `1.6.8-0`:

- upstream repository: https://github.com/OctoMap/octomap.git
- release repository: https://github.com/ros-gbp/octomap-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.11`
- previous version for package: `1.6.7-0`