Maven build: Add dependency convergence checking

[AlexDBlack]

https://maven.apache.org/enforcer/enforcer-rules/dependencyConvergence.html

To automatically detect issues like this: #8724

The check of course doesn't fix the issue, but at least we won't be surprised by them (the aforementioned issue slipped through 1.0.0-beta6 pre-release testing due to luck - a different order of a couple of dependencies in the pom.xml would have caused problems)

[tballison]

+1
This issue duplicates:
#5601