RFR: JDK-8284858: Start of release updates for JDK 20

Thu May 26 23:05:33 UTC 2022

On Thu, 26 May 2022 22:40:59 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> You also need to change the JBS version from 19 to 20 in [`.jcheck/conf`](https://github.com/openjdk/jdk/blob/6a33974a6b8a629744c6d76c3b4fa1f772e52ac8/.jcheck/conf#L4):

Acknowledged; will fix in the next push. Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/8236