Constructor `protected` -> `private` in `final` class detected as `CONSTRUCTOR_LESS_ACCESSIBLE`

[scordio]

In a final class, a visibility change of a constructor from protected to private is detected as CONSTRUCTOR_LESS_ACCESSIBLE:

Comparing binary compatibility of assertj-core-3.22.1-SNAPSHOT.jar against assertj-core-3.22.0.jar
***! MODIFIED CLASS: PUBLIC FINAL org.assertj.core.api.Fail  (not serializable)
    ===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
    ***! MODIFIED CONSTRUCTOR: PRIVATE (<- PROTECTED) Fail()

Although it's a proper detection considering only the constructor visibility, I am wondering if this could be correlated with the fact that the class is final and there is no way it can be extended, so it shouldn't be an incompatible change.

[siom79]

Fixed: 0.15.5