Following framework module versioning

[sdelamo]

The 5.2.0 Release should have been a 6.0.0 release instead of 5.2.0 because it includes a major upgrade to openapi-generator. .

We should follow the Module Update strategy.

I am going to release 6.0.0 to signal that mayor upgrade and we will include 6.0.0 in 4.2.0 BOM.