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

[Jonah Graham]

On Wed, 16 Dec 2020 23:40:20 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> Also updating the babel bundles for the 2020-09 platform.

releng/platform-definitions/platform-definition-2020-12/platform-definition-2020-12.target line 55:

> 53:             <unit id="org.eclipse.pde.feature.group" version="3.14.600.v20201202-1800"/>
> 54:             <unit id="org.eclipse.platform.sdk" version="4.18.0.I20201202-1800"/>
> 55:             <repository location="http://download.eclipse.org/releases/2020-12/"/>

Try using https:// to workaround the http -> https redirect issue at download.eclipse.org.

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