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ARROW-11144: [CI][C++][Python] Move to newer Hadoop version

Hadoop 2.9.2 is obsolete and not available for download anymore.
Move to the latest "GA" release.

Closes #9112 from pitrou/ARROW-11144-hdfs

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>