Bump version for v1.15.59 release #289

Job	Run time
Run test and build (ubuntu-latest)	1m 39s
Run test and build (macos-15)	2m 56s
Run test and build (macos-14)	1m 46s
Run test and build (ubuntu-24.04-arm)	1m 36s
Run test and build (macos-15-intel)	4m 49s
	12m 46s

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