Context:
See parent ticket

AT:

• the dmn-js library is updated so it supports DMN 1.3 diagrams
• DMN 1.2 diagrams are migrated on the fly to 1.3 DMN diagrams since dmn-js doesn't support DMN 1.2

Hint:
You can use dmn-migrate to convert DMN 1.2 diagrams to 1.3:
https://github.com/bpmn-io/dmn-migrate