Fixes#1047. We can't go any higher since that's an API-breaking change. In any event, this will likely disappear in 5.0.0 anyway, because Configurate 4.x now shades SnakeYAML internally.
Spiritually indebted to #518 and @alexstaeding.
There's a minor break - we're going up to 3.2.0-SNAPSHOT as the API now compiles against Java 11. But this is more academic in practice.
