Bump version for v1.15.55 release #281

Job	Run time
Run test and build (ubuntu-24.04-arm)	48s
Run test and build (ubuntu-latest)	42s
Run test and build (macos-14)	1m 10s
Run test and build (macos-15)	1m 20s
Run test and build (macos-15-intel)	2m 40s
	6m 40s

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