Default version of Awailitility is not compatible with Kotlin 1.9 baseline

[agebhar1]

In #44602 awaitility was upgraded from 4.2.2 to 4.3.0. From the changeset of 4.3.0 awaitility/awaitility@awaitility-4.2.2...awaitility-4.3.0 the required Kotlin version was upgraded to 2 awaitility/awaitility@2a9814b.

Spring Boot 3.5 depends on Kotlin 1.9.x which breaks compilation of existing projects.

[philwebb]

I'd probably vote for a downgrade in this instance. Looking at the awaitility changelog it seems like the new untilAsserted supplier and a consumer methods are the main new feature for Java users. I think I'd rather keep Kotlin compatibility and make Java users override the version if they want the new feature.

We can upgrade in 4.0.0 since we'll be on a Kotlin 2 baseline.