RFR: 8321123: [Shenandoah/JDK21] Fix repo permissions

[Aleksey Shipilev]

On Thu, 30 Nov 2023 15:53:07 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> The Shenandoah/JDK21u repo has the wrong permissons: it inherits permissions from jdk-updates, but should use permission from she Shenandoah project instead.

Marked as reviewed by shade (Reviewer).

Wait, no, the version is also incorrect. I would say it should be just `21`?

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PR Review: https://git.openjdk.org/shenandoah-jdk21u/pull/3#pullrequestreview-1757850998
Changes requested by shade (Reviewer).

PR Review: https://git.openjdk.org/shenandoah-jdk21u/pull/3#pullrequestreview-1757851663