Bump version for v1.15.44 release #258

Job	Run time
Run test and build (ubuntu-24.04-arm)	1m 22s
Run test and build (ubuntu-latest)	1m 43s
Run test and build (macos-15-intel)	3m 43s
Run test and build (macos-15)	2m 37s
Run test and build (macos-14)	1m 56s
	11m 21s

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