RFR: Build: Update to JDK 15.0.2

[Andrea Cosentino]

On Wed, 3 Feb 2021 09:13:07 GMT, Erik Helin <ehelin at openjdk.org> wrote:

>> I don't know if there is something else to do on my side.
>
> @oscerd you can just merge the `master` branch into your branch `jdk-15.0.2` (the merge commit will be automatically squashed when we integrate your changes, so don't worry). Then push the merge commit, then the GitHub Actions will be triggered ��

Done

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PR: https://git.openjdk.java.net/skara/pull/989