Android Java is stuck in a subset of Java 17 LTS, released in 2021, hardly almost identical to mainline.

And this only happened, most likely because the Android team realised Kotlin was losing access to modern Java libraries, with ART being stuck in Java 8, so there was an update cycle for Java 11, followed by one for Java 17.

So far there are no public plans to update ART for something newer in Android 16, from the previews made available thus far, they actually also started rewriting OS components into Kotlin, it is no longer only Jetpack libraries.