[python] Temporarily pin to AnnData 0.9.* (#1766) (#1771)

Co-authored-by: John Kerl <[email protected]>

apis/python/setup.py

@@ -269,7 +269,9 @@ def run(self):
     install_requires=[
         # Needed for Python 3.7 which anndata 0.9 doesn't support but we do
         "anndata < 0.9; python_version<'3.8'",
-        "anndata; python_version>='3.8'",
+        # Temporary until we align with a compatibility issue in AnnData 0.10.0.
+        # This is tracked in https://github.com/single-cell-data/TileDB-SOMA/issues/1765.
+        "anndata < 0.10.0; python_version>='3.8'",
         "attrs>=22.2",
         # Pinning numba & its particular numpy constraints:
         # The old pip solver (<=2020) doesn't deal with the transitive