RFR: 7378: Update platform to 2021-06

Mon Sep 6 13:00:52 UTC 2021

On Mon, 9 Aug 2021 22:08:14 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> ...and removing old ones.

> We could revert this change with module export added in its respective pom.xml (commented above).

I think it's fine. We don't support Java 1.4 anymore. :)

@guruhb - do you happen to know if there is a way to suppress all the new Tycho warnings?

(Maven Artifact blablabla is not a bundle and will be ignored, automatic wrapping of such artifacts can be enabled with <pomDependencies>wrapAsBundle</pomDependencies> in target platform configuration)

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PR: https://git.openjdk.java.net/jmc/pull/301