dunder attribute __repo__ of DataModel should start with "https:" instead of "git:"

[haeussma]

When reading in a serialized instance of a DataModel (e.g. .yaml) by using

path = "path_to_serialized_datamodel.yaml"
dataset, lib = sdRDM.DataModel.parse(path=path)

the lib cannot be created since __repo__ in __source__contains the right url, which starts with "git:" instead of "https:".

Solution:
__repo__ url should start with "https:"

[JR-1991]

Fixed by #14