jenkins/CONTRIBUTING.md states "Maven 3.5.4 or above" however build fails with:

[WARNING] Rule 1: org.apache.maven.plugins.enforcer.RequireMavenVersion failed with message: 3.8.1 required to no longer download dependencies via HTTP (use HTTPS instead).

I can't say version 3.8.1 will complete the build but I can say "3.5.4" as written created the false belief Ubuntu Maven version 3.6.3 was sufficient so I ask what version should be specified?