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

[aptmac]

This PR addresses JMC-7353 [0] (and JMC-7356 [1]), 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], 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

---

Progress

• Commit message must refer to an issue
• Change must be properly reviewed

Issue

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

Reviewers

• Marcus Hirt (@thegreystone - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jmc pull/281/head:pull/281
$ git checkout pull/281

Update a local copy of the PR:
$ git checkout pull/281
$ git pull https://git.openjdk.java.net/jmc pull/281/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 281

View PR using the GUI difftool:
$ git pr show -t 281

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jmc/pull/281.diff

[bridgekeeper]

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[mlbridge]

Webrevs

• 00: Full (ef8e90fc)

[thegreystone]

Thanks for looking into this Alex!

[openjdk]

@aptmac This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

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

Reviewed-by: hirt

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[aptmac]

/integrate

[openjdk]

Going to push as commit 0113da9.

[openjdk]

@aptmac Pushed as commit 0113da9.

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