https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.18
This involves @SuppressWarnings("deprecation") markers for can(De)Serialize checks which are deprecated without replacement now. We'll keep using them for the time being for backwards compatibility.
Runtime compatibility with older Jackson versions is retained so far, at least back to Jackson 2.15 which we keep testing against in the 6.1.x branch.