Bump version for v1.15.48 release #267

Job	Run time
Run test and build (ubuntu-latest)	1m 38s
Run test and build (macos-15-intel)	3m 34s
Run test and build (macos-15)	2m 37s
Run test and build (macos-14)	2m 59s
Run test and build (ubuntu-24.04-arm)	1m 26s
	12m 14s

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