Tighten TileDB pypi dependency to be a 0.21.x version. (#1299)

It was brought up to me that using `tiledb>=0.21.2` could result in
v0.22.0 matching, which is not what we want (this would cause a core
version mismatch, which is Bad™). Instead, we should pin to `~=0.21.2`,
which means "any v0.21.x version where x >= 2".

apis/python/setup.py

@@ -289,7 +289,7 @@ def run(self):
         "scanpy>=1.9.2",
         "scipy",
         "somacore==1.0.2",
-        "tiledb>=0.21.2",
+        "tiledb~=0.21.2",
         "typing-extensions",  # Note "-" even though `import typing_extensions`
     ],
     extras_require={