[python] Drop `anndata` version pin; use `CSCDataset`/`CSRDataset` #776

Job	Run time
setuptools (ubuntu-22.04)	5m 51s
SO copying (docker) TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	5m 45s
setuptools (macos-12)	8m 20s
SO copying (docker) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	5m 36s
SO copying (macos) TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	14m 12s
SO copying (macos) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	10m 23s
SO copying (docker) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	5m 26s
SO copying (macos) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	7m 53s
Wheel from sdist (ubuntu-22.04)	4m 27s
Wheel from sdist (macos-12)	7m 3s
	1h 14m 56s

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