Bump version for v1.15.54 release #279

Job	Run time
Run test and build (ubuntu-latest)	38s
Run test and build (ubuntu-24.04-arm)	47s
Run test and build (macos-15-intel)	1m 56s
Run test and build (macos-15)	1m 12s
Run test and build (macos-14)	1m 9s
	5m 42s

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