chore: pin uberon ontology version

[atolopko-czi]

Fixes #355

Testing is just unit tests, but these load the real ontology file, so should be sufficient.

[codecov]

Codecov Report

Merging #388 (17f884b) into main (8f7af94) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #388   +/-   ##
=======================================
  Coverage   88.33%   88.34%           
=======================================
  Files          50       50           
  Lines        2727     2728    +1     
=======================================
+ Hits         2409     2410    +1     
  Misses        318      318           

Flag	Coverage Δ
unittests	88.34% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...src/cellxgene_census_builder/build_soma/globals.py	100.00% <100.00%> (ø)
...llxgene_census_builder/build_soma/tissue_mapper.py	84.81% <100.00%> (ø)

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[brianraymor]

The uberon release version is correct.