Document supported CLDR versions in the javadoc

CLDR has been upgraded (almost) per JDK release. For maintainability, listing supported versions for each JDK release would be helpful. Since it is an implementation detail, possibly be provided with an `@implNote` tag.
Here's the list:
---
jdk8: 21.0.1
jdk9: 29
jdk11: 33
jdk13: 35.1
jdk14: 36
jdk15: 37
jdk16: 38
jdk17: 39
jdk19: 41
jdk20: 42
jdk21: 43
jdk22: 44