A DESCRIPTION OF THE PROBLEM :
Issue JDK-8073927 was reported against Java SE 8. At the time,`@Deprecated` did not have the `forRemoval` attribute yet. So while the issue was acknowledged, it was closed as "won't fix", simply because there was no way to be able to eventually remove the wrong method.

Now that we have `forRemoval`, fixing this issue has become trivial:
* in a first step (probably JDK 27), introduce `getNanos` and mark `getNano` as deprecated for removal, pointing to `getNanos` in its deprecation text
* in a second step (probably JDK 30), remove `getNano`