Bump ol from 6.11.0 to 6.12.0
Bump ol from 6.11.0 to 6.12.0

Bumps [ol](https://github.com/openlayers/openlayers) from 6.11.0 to 6.12.0.
- [Release notes](https://github.com/openlayers/openlayers/releases)
- [Commits](https://github.com/openlayers/openlayers/compare/v6.11.0...v6.12.0)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
camptocamp/ngeo,camptocamp/ngeo,camptocamp/ngeo,camptocamp/ngeo,camptocamp/ngeo