pandas 1.3 fix pbmc dataset

[adamgayoso]

No description provided.

[codecov]

Codecov Report

Merging #1099 (ff67d07) into master (bc415d8) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1099      +/-   ##
==========================================
- Coverage   90.64%   90.64%   -0.01%     
==========================================
  Files          91       91              
  Lines        6885     6884       -1     
==========================================
- Hits         6241     6240       -1     
  Misses        644      644              

Impacted Files	Coverage Δ
scvi/data/_built_in_data/_pbmc.py	74.64% <100.00%> (-0.36%)	⬇️

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