Revert "[AN-304] Bioconductor 3.20.0 image update"

[LizBaldo]

Reverts #4807

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.77%. Comparing base (35c2b85) to head (09357f8).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4812   +/-   ##
========================================
  Coverage    74.77%   74.77%           
========================================
  Files          165      165           
  Lines        14954    14954           
  Branches      1187     1187           
========================================
  Hits         11182    11182           
  Misses        3772     3772           

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[lucymcnatt]

just waiting on the custom img generation to finish: https://github.com/DataBiosphere/leonardo/actions/runs/12284717757