pin zarr<3 #440

Job	Run time
py3.13 \| macos \| integration tests	13m 54s
py3.13 \| ubuntu \| integration tests	17m 0s
mypy	3m 53s
py3.13 \| windows \| integration tests	29m 47s
py3.13 \| macos \| unit tests	7m 45s
py3.13 \| ubuntu \| unit tests	12m 54s
py3.10 \| ubuntu \| integration tests	18m 52s
py3.13 \| windows \| unit tests	22m 10s
py3.10 \| ubuntu \| unit tests	12m 40s
py3.11 \| ubuntu \| unit tests	13m 9s
py3.12 \| ubuntu \| unit tests	13m 33s
merge-test-artifacts	2s
	2h 45m 39s

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