RFR: 7353: JMC fails to build because it can't download babel dependency

[Marcus Hirt]

On Fri, 23 Jul 2021 14:52:29 GMT, Alex Macdonald <aptmac at openjdk.org> wrote:

> This PR addresses JMC-7353 [[0]](https://bugs.openjdk.java.net/browse/JMC-7353) (and JMC-7356 [[1]](https://bugs.openjdk.java.net/browse/JMC-7356)), in which JMC cannot build because the babel dependency is unable to be downloaded: 
> 
> [ERROR] All attempts to read artifact osgi.bundle,org.eclipse.compare.core.nl_ja,4.19.0.v20210327020002 failed:
> [ERROR] An error occurred while transferring artifact canonical: osgi.bundle,org.eclipse.compare.core.nl_ja,4.19.0.v20210327020002 from repository
> https://archive.eclipse.org/technology/babel/update-site/R0.18.3/2021-03
> 
> 
> This is due to a recent update to babel for platforms 2020-12 and 2021-03 (and 2021-06, but that doesn't affect us yet ..) [[2]](https://www.eclipse.org/babel/downloads.php), which resulted in a new url being required to fetch the current supported version of babel for 2021-03. This PR updates the url and version of babel for the 2021-03 target platform.
> 
> Note that there is also an updated link for the 2020-12 babel, but the older babel isn't causing any problems downloading at the moment, so I've decided to only update the 2021-03 target platform here. 
> 
> To verify this you can blow-up your ~/.m2 folder and try a clean install with 2021-03 as the active platform.
> 
> [0] https://bugs.openjdk.java.net/browse/JMC-7353
> [1] https://bugs.openjdk.java.net/browse/JMC-7356
> [2] https://www.eclipse.org/babel/downloads.php

Marked as reviewed by hirt (Lead).

Thanks for looking into this Alex!

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PR: https://git.openjdk.java.net/jmc/pull/281