Switch to Java 21 #162

Job	Run time
Compile everything	6m 22s
Testing, coordination/base - 4317 - coordination-base - Base distributed coordination tests	52m 0s
Testing, storage/block/base - 4319 - storage-block-base - Base distributed block storage tests	54m 20s
Testing, storage/block/balancer - 4321 - storage-block-balancer - Distributed block storage balancer tests	6h 0m 15s
Testing, storage/block/blockmanagement - 4323 - storage-block-blockmanagement - Distributed block storage management tests	46m 34s
Testing, storage/block/datanode - 4325 - storage-block-datanode - Distributed block storage datanode tests	41m 36s
Testing, storage/block/dfs-base - 4327 - storage-block-dfs-base - Base distributed block dfs storage tests	54m 7s
Testing, storage/block/fs-base - 4329 - storage-block-fs-base - Base distributed block fs storage tests	24m 20s
Testing, storage/block/misc - 4331 - storage-block-misc - Misc distributed block storage tests	6h 0m 21s
	16h 39m 55s

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