RFR: Merge jdk21u

[Man Cao]

On Tue, 30 Jul 2024 22:50:05 GMT, Jiangli Zhou <jiangli at openjdk.org> wrote:

> > Could we create a new branch (e.g. "tsan-21u") in the TSAN project to track TSAN based on JDK 21u? The current "tsan" branch in intended to track OpenJDK's tip.
> 
> SG for creating tsan-21u branch.

Asked in https://bugs.openjdk.org/browse/SKARA-2345 to allow creating new branches.

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PR Comment: https://git.openjdk.org/tsan/pull/21#issuecomment-2259375365