Specification for dependency version conflict resolution

### Improvement proposal

Just as there is a specification for the "dependency version requirement".
https://maven.apache.org/pom.html#Dependency_Version_Requirement_Specification

There should be a specification for "dependency version conflict resolution".

For example, if I import 2 BOM files into a `dependencyManagement` section, and they both specify a version for the same dependency, then which takes priority?

This page does not answer that question
https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html

Compare the linked Dependency Version Requirement Specification with the Introduction to the Dependency Mechanism guide. Investigate how overlapping BOM entries in dependencyManagement are resolved, then document the priority rule with a concrete example. Done means the published specification answers the stated conflict-resolution question unambiguously.

Written by the indexing model from the issue text.