Updated all data models to the last version of json schema

NOTE: We did yesterday 17-9 the changes. Unfortunately we made a mistake and now we have to revert all these changes, do it again properly and push. this Friday will be ready if not earlier.

NOTE2: It is already updated. Its Wednesday 15:30. Hopefully this time we made no errors.

The single-source-of-truth  of the data models is the json schema (file schema.json). This json schema has a tag ‘$schema’ indicating the meta schema the schema is compliant with.

Now all data models have been updated to the last one “https://json-schema.org/draft/2020-12/schema”

Therefore some errors provided by validators due to the obsolete previous value have been removed.

Thanks to the user Elliopardad in GitHub for its contribution and to the community of json schema for its support.

As we announce earlier we are one of the project listed in its global landscape of projects.