Pin docker version to 19.03.8
Our CI machine runs a Docker version which is too old otherwise. Hopefully to be fixed in the near future
The old module-image for the shared runners will be discontinued on October 31. All users still referencing gitlab-registry.mpcdf.mpg.de/mpcdf/module-image in their CI pipelines need to switch to the new CI images now, see instructions here.
Our CI machine runs a Docker version which is too old otherwise. Hopefully to be fixed in the near future