[SPARK-44939][R] Support Java 21 in SparkR SystemRequirements

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to update SystemRequirements to support Java 21 in SparkR.

Why are the changes needed?

To support Java 21 officially in SparkR. We've been running SparkR CI on master branch.

• https://github.com/apache/spark/actions/runs/5946839640/job/16128043220

Does this PR introduce any user-facing change?

No.

How was this patch tested?

On Java 21, do the following.

$ build/sbt test:package -Psparkr -Phive

$ R/install-dev.sh; R/run-tests.sh
...
Status: 2 NOTEs
See
  ‘/Users/dongjoon/APACHE/spark-merge/R/SparkR.Rcheck/00check.log’
for details.


+ popd
Tests passed.

Was this patch authored or co-authored using generative AI tooling?

No.

[yaooqinn]

LGTM

[dongjoon-hyun]

Thank you, @yaooqinn !

[dongjoon-hyun]

Thank you, @LuciferYang .

[dongjoon-hyun]

I verified this manually with the procedure in the PR description. Merged to master for Apache Spark 4.