Fix compilation issue w/ `DslTest`, jackson-databind change https://github.com/FasterXML/jackson-databind/issues/5272

[cowtowncoder]

Looks like change in databind for:

FasterXML/jackson-databind#5272

broke Kotlin modules DslTest. I suspect change for Collection<JacksonModule> return type to Stream<JacksonModule> should be simple, but my Kotlin skills are bit lacking (I'll see what ChatGTP says tho).

cc @k163377

[cowtowncoder]

With some GenAI help, think I figured it out (see #1029).