minor fix for streaming correcly streaming anndata #195

Job	Run time
Test zarr-python v3 compatibility	1m 12s
ubuntu-latest (3.10)	1m 21s
check-manifest	28s
macos-latest (3.10)	1m 3s
windows-latest (3.10)	1m 26s
ubuntu-latest (3.11)	47s
macos-latest (3.11)	1m 1s
windows-latest (3.11)	1m 47s
ubuntu-latest (3.12)	1m 24s
macos-latest (3.12)	40s
windows-latest (3.12)	3m 11s
Deploy	0s
	14m 20s

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