Update Default Maven Version To 3.2.latest

[Alex Courtis]

Platform 3.0 is coming, along with imported poms in dependency management.

This causes massive (can't build) problems with 2.1.0 and occasional issues with 3.0.x, where transitive dependencies have incorrect scopes.

Even if the project doesn't use these imports, if any of its transitives do e.g. SAL, Plugins etc., they are still subject to this problem.

3.2.x resolves all these issues.

[mjensenbitbucket-bot]

As part of doing this please make a tag and update the brew formula.