RFR: 7062: Update to the Eclipse 2020-12 platform

[Marcus Hirt]

On Mon, 21 Dec 2020 12:38:57 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> After playing around a bit more, there seems to be some problem with the Chromium based browser component on Windows when using 2020-12. I'm withdrawing this for now - the big sur fixes will have to wait.
>
> Might want to take this, but keep 2020-09 as a default, for two reasons:
> 
> 1. It makes it easier for people to try 2020-12 based builds (override with -P2020-12).
> 2. It uses the most recent babel release.

This might be the reason for the problems on 2020-12:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=569039

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PR: https://git.openjdk.java.net/jmc/pull/185