Fix conversion of Zarr string dataset to HDF5 #2198

Job	Run time
linux-python3.12-ros3	1m 20s
linux-gallery-python3.12-upgraded	1m 12s
linux-gallery-python3.8-minimum	49s
windows-gallery-python3.12-upgraded	1m 46s
windows-gallery-python3.8-minimum	1m 39s
conda-linux-python3.8-minimum	2m 44s
conda-linux-python3.12-upgraded	2m 27s
linux-python3.12	2m 4s
linux-python3.12-upgraded	2m 13s
linux-python3.8-minimum	1m 54s
macos-python3.12-upgraded	1m 19s
windows-python3.8-minimum	2m 53s
macos-python3.8-minimum	2m 30s
windows-python3.12-upgraded	2m 46s
Deploy pre-release from dev	0s
	27m 36s

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