RFR: 7046: Update to the 2021-03 platform

[Guru Hb]

On Fri, 2 Apr 2021 00:05:51 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> Also updating to latest babel for the platform versions that are available in 0.18.3.
> 
> Depending on if #234 gets in before or after this one, either this one will need to be updated to remove the chromium entry, or #234 will need to be updated to do it.
> 
> (Is it just me, or does JMC start really fast on 4.19? :) )

Compiled on Ubuntu, Mac and Windows did some basic sanity test. Looks good to me.

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Marked as reviewed by ghb (Reviewer).

PR: https://git.openjdk.java.net/jmc/pull/235