[r] Depend on TileDB-R 0.21.3

[johnkerl]

Issue and/or context: #1867 #1862

Changes:

Notes for Reviewer:

[eddelbuettel]

We can also consider leaving it as is. By pointing at the very installation sources we point at, version 0.21.3 will be installed once available (as it is the highest version). By putting constraints up like this we effectively only risk breaking builds where the constraint is not yet satisfied, i.e. at CRAN it can take days to get macOS builds, and we also have seen Conda builds delayed or failing for various reasons. Ditto for r2u which can be a day or more behind at times.

Luckily we currently only depend on r-universe which is quicker. But I am wary of putting up constraints when we don't really have to.

[codecov-commenter]

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[johnkerl]

@eddelbuettel queries on enumerated columns is broken without this -- which is spec-incompliant. And it needs to work in Conda, passing requirements, before Conda-build and tagging. See also https://github.com/single-cell-data/TileDB-SOMA/wiki/Branches-and-releases.

[eddelbuettel]

@johnkerl You are answering a question that is different from the one I asked.