revert to pre-bump versions in codebase

[ejmolinelli]

Reason for Change

• keep versioning in sync. The versions should all be set to their pre-bumped versions.

Changes

• The version in the CLI setup.py was set to its post-bump version, and is now reverted to its pre-bump version i.e. 5.2.3

Testing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.29%. Comparing base (44947f4) to head (88f2c52).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1290      +/-   ##
==========================================
- Coverage   89.33%   89.29%   -0.05%     
==========================================
  Files          21       21              
  Lines        2373     2373              
==========================================
- Hits         2120     2119       -1     
- Misses        253      254       +1     

Components	Coverage Δ
cellxgene_schema_cli	89.93% <ø> (-0.06%)	⬇️
migration_assistant	91.26% <ø> (ø)
schema_bump_dry_run_genes	79.74% <ø> (ø)
schema_bump_dry_run_ontologies	99.53% <ø> (ø)

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